NATHANIEL BENJAMIN BERG MD
NPI 1265646806
Radiology - Vascular & Interventional Radiology in Tamuning, GU

Q: What is Nathaniel Berg's NPI number?

The NPI number for Nathaniel Berg is 1265646806. It was assigned to this individual provider in the NPPES registry on May 10, 2007.

Q: What is Nathaniel Berg's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Vascular & Interventional Radiology, with taxonomy code 2085R0204X.

Q: When was this NPI record last updated?

The NPPES record for Nathaniel Berg was last updated on December 9, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 10, 2007PECOS EnrolledAccepts Medicare Assignment

88.06/100

CMS Quality Rating

633 GOVERNOR CARLOS CAMACHO ROAD, SUITE 210, TAMUNING, GU 96913(671) 649-1001(671) 649-1002 Get Directions Write a Review

NPPES record last updated: December 9, 2019. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Dec 9, 2019, May 15, 2018 (2 updates tracked since 2018).

On this page

About Nathaniel Benjamin Berg Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

NATHANIEL BENJAMIN BERG MD (NPI 1265646806) is an individual vascular & interventional radiology provider in Tamuning, Guam, licensed in Guam (M-1142) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Guam Memorial Hospital Authority, and is a graduate of Tufts University School Of Medicine (1990).

NPPES Registry Identity

NPI1265646806

Entity TypeIndividualMale

Primary Taxonomy2085R0204X

Provider Legal NameNATHANIEL BENJAMIN BERGCredential: MD

Location Address633 GOVERNOR CARLOS CAMACHO ROAD, SUITE 210Tamuning, GU 96913

Mailing Address633 Governor Carlos Camacho Road, Suite 210Tamuning, GU 96913 · (671) 649-1001 · Fax (671) 649-1002

Phone(671) 649-1001

Fax(671) 649-1002

Sole ProprietorNo

Medical School CMSTufts University School Of MedicineGraduated 1990

Enumeration DateMay 10, 2007

Last NPPES UpdateDecember 9, 20192 updates tracked since enumeration

✔ NPI 1265646806 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyRadiology · Vascular & Interventional RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0204X

License✔ Licensed in GU · M-1142

Definition

A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging.

Also ListedRadiology · Nuclear RadiologyTaxonomy 2085N0904X · License M-1142 (GU)

Also ListedRadiology · Diagnostic RadiologyTaxonomy 2085R0202X · License M-1142 (GU)

Also ListedPain Medicine · Interventional Pain MedicineTaxonomy 208VP0014X · License M-1142 (GU)

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Nathaniel Benjamin Berg Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID244129922

PECOS Enrollment IDI20170703001328

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Nathaniel Berg reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Commonwealth Healthcare Corporation

Rural Health

SAN JOSE VILLAGE, CORNER OF CANAL STREET & BROADWAY
Tinian, MP 96952

Reassigned Medicare billing, Northern Mariana Islands enrollment
200 clinicians in this Medicare group

NPI 1003382854 (670) 433-9233

Guam Healthcare Development Incorporated

Clinic/Center

133 ROUTE 3
Dededo, GU 96929

Reassigned Medicare billing, Guam enrollment
432 clinicians in this Medicare group

NPI 1326447939 (671) 645-5500

Guam Medical Imaging Center LLC

Nuclear Radiology

472 CHALAN SAN ANTONIO, SUITE 111
Tamuning, GU 96913

Reassigned Medicare billing, Guam enrollment
7 clinicians in this Medicare group

NPI 1770707945 (671) 649-9227

Guam X-Ray

Vascular & Interventional Radiology

633 GOV CARLOS G CAMACHO RD, GUAM MEDICAL PLAZA, SUITE 210
Tamuning, GU 96913

Reassigned Medicare billing, Guam enrollment
103 clinicians in this Medicare group

NPI 1376767426 (671) 649-1001

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 50

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml Q9967

Low osmolar contrast material with 300-399 mg/ml iodine concentration is a diagnostic tool used in imaging procedures. It helps to enhance the visibility of specific areas in the body, aiding in accurate diagnosis. It's safe and generally well-tolerated by patients.

20,462 services191 patients

Injection, gadoterate meglumine, 0.1 ml A9575

Gadoterate meglumine is a contrast agent used in MRI scans to help visualize certain areas of your body more clearly. It's injected into your bloodstream, typically through a vein in your arm, and helps doctors get more detailed images.

2,660 services18 patients

Routine electrocardiogram (ecg) using at least 12 leads with tracing 93005

An Electrocardiogram (ECG) is a simple, painless test that records the heart's electrical activity. Using 12 leads attached to your skin, it generates a tracing of your heart rhythm. It helps detect any heart problems by showing the timing and strength of electrical signals passing through each part of your heart.

1,420 services992 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

1,147 services1,061 patients

Counseling visit to discuss need for lung cancer screening using low dose ct scan (ldct) (service is for eligibility determination and shared decision making) G0296

This visit involves discussing the necessity of a lung cancer screening using a low dose CT scan. It's a chance to determine if you're eligible for the test and to make an informed decision about proceeding. The scan can potentially detect lung cancer early, improving treatment outcomes.

355 services355 patients

Electrocardiogram (ecg) 2-day continuous 93225

An Electrocardiogram (ECG) 2-day continuous is a non-invasive test that records the electrical activity of your heart over 48 hours. It helps to detect irregular heart rhythms, heart disease, or other cardiac conditions. You wear a portable device that records heart activity as you go about your daily activities.

327 services302 patients

Electrocardiogram (ecg) 2-day continuous with report 93226

An Electrocardiogram (ECG) is a test that records the electrical activity of your heart over a 2-day period. It helps doctors understand how well your heart is working. A small device is attached to your chest to record the data. A report is then prepared based on these findings.

326 services301 patients

Ultrasound of leg arteries or artery grafts 93925

An ultrasound of leg arteries or artery grafts is a non-invasive imaging test. It uses high-frequency sound waves to capture live images from inside your body, specifically your leg arteries or grafts. This helps in detecting any blockages or abnormalities.

275 services250 patients

Ultrasound of hemodialysis access 93990

An ultrasound of hemodialysis access is a non-invasive procedure that uses sound waves to create images of your dialysis access site. It helps monitor the access site's health and detect any potential issues like blockages or narrowing.

263 services208 patients

Injection, heparin sodium, per 1000 units J1644

Heparin sodium injection is a blood-thinning medication given to prevent blood clots. It's administered in units, with each dose tailored to your needs. This service refers to the administration of 1000 units of this medication.

209 services48 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

160 services81 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician 93016

An exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.

154 services153 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) 93017

An exercise or drug-induced heart stress test with an ECG checks how your heart responds to stress. You'll either exercise on a treadmill or be given medication to stress your heart. An ECG then captures your heart's activity, helping detect any issues.

154 services153 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

143 services132 patients

Dxa bone density measurement of hip, pelvis, spine 77080

A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.

140 services140 patients

Injection, midazolam hydrochloride, per 1 mg J2250

Midazolam hydrochloride is a medication injected to help you relax or sleep before surgery or certain medical procedures. It works by calming the brain and nerves. It's given in small doses, measured in milligrams (mg).

140 services72 patients

Use of a drug to induce depression of consciousness by physician performing a procedure, each additional 15 minutes 99153

This service involves a physician administering medication to lower your consciousness during a procedure. It's done for your comfort and safety. The drug's effects last about 15 minutes, so additional doses may be given as needed.

135 services86 patients

Low osmolar contrast material, 200-299 mg/ml iodine concentration, per ml Q9966

Low osmolar contrast material with 200-299 mg/ml iodine concentration is a type of dye used in certain medical tests like CT scans or X-rays. It helps to highlight specific areas in your body, making them easier to see and examine. It's safe and commonly used.

122 services29 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

93 services86 patients

Injection, fentanyl citrate, 0.1 mg J3010

Fentanyl citrate is a potent pain medication administered via injection. The 0.1 mg dosage is used to manage severe pain conditions. It works by blocking pain signals to the brain. It's crucial to follow the dosage instructions to prevent potential side effects.

86 services79 patients

Technetium tc-99m oxidronate, diagnostic, per study dose, up to 30 millicuries A9561

Technetium Tc-99m Oxidronate is a diagnostic procedure. A small amount of radioisotope is injected into your body, which collects in certain bones. A special camera then captures images of the bones, helping to detect any abnormalities or diseases.

64 services58 patients

Nuclear medicine study of bone and/or joint whole body 78306

A nuclear medicine study of bone and/or joint whole body involves injecting a small amount of radioactive material into your body. This material travels to your bones and emits energy. A special camera captures this energy, creating images of your bones to help identify any abnormalities.

63 services57 patients

X-ray of chest, 2 views 71046

A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.

61 services42 patients

Ct scan of abdominal aorta and both leg arteries with contrast 75635

A CT scan of the abdominal aorta and both leg arteries with contrast is a medical imaging procedure. A special dye is injected to make your blood vessels visible on the scan. This helps to check for any blockages or abnormalities in these areas.

55 services55 patients

Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist 93458

This procedure involves placing a tube into your left lower heart chamber and coronary artery. It helps doctors diagnose heart conditions by allowing them to view these areas in detail. A radiologist will review the images to ensure accurate diagnosis.

50 services47 patients

Ultrasound of one leg arteries or artery grafts 93926

An ultrasound of leg arteries or artery grafts is a non-invasive test using sound waves to create images of your blood vessels. This helps doctors assess blood flow, identify blockages, and monitor the health of grafts.

38 services31 patients

Test to measure expiratory airflow and volume changes before and after medication administration 94060

This procedure measures how air flows in and out of your lungs. It's done before and after medication to see if the treatment improves your breathing. It's a simple, non-invasive test that involves breathing into a device called a spirometer.

37 services36 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

34 services28 patients

Ct scan of chest before and after contrast 71270

A CT scan of the chest before and after contrast is a non-invasive imaging procedure. Initially, images of the chest are taken without contrast to get a baseline. Then, a contrast dye is administered, usually through a vein, to highlight specific areas, making them easier to see. The procedure helps in diagnosing various chest conditions.

32 services31 patients

Limited ultrasound scan of abdomen 76705

A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.

31 services12 patients

Ct scan head or brain without contrast 70450

A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.

29 services28 patients

Low dose ct scan of chest for lung cancer screening 71271

A low-dose CT scan of the chest is a quick, painless procedure that uses a small amount of radiation to create detailed images of your lungs. It's a key tool for early detection of lung cancer, especially for those at high risk.

29 services29 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

28 services27 patients

Ct scan of abdomen and pelvis before and after contrast 74178

A CT scan of your abdomen and pelvis with and without contrast helps visualize your internal organs better. Contrast is a special dye that improves the clarity of the images. It's taken orally or injected into your veins before the scan. The process is painless and quick.

27 services27 patients

Infusion, normal saline solution, sterile (500 ml = 1 unit) J7040

An infusion of a normal saline solution is a common medical procedure. Sterile saline (salt water) is administered into your bloodstream via a drip. This helps to maintain fluid balance in your body, especially when you're unable to drink enough liquids.

27 services22 patients

Complete ultrasound of artery and vein blood flow pre-op assessment on both sides of body for hemodialysis access 93985

This procedure involves using ultrasound technology to examine the blood flow in your arteries and veins on both sides of your body. It's crucial for preparing for hemodialysis access, ensuring safe and effective treatment.

26 services25 patients

Ultrasound scan of head and neck soft tissue 76536

An ultrasound scan of the head and neck soft tissue is a non-invasive procedure that uses sound waves to create images of the soft tissues in these areas. It helps identify any abnormalities or issues, such as tumors, cysts, or infections. It's painless and doesn't involve radiation.

24 services21 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

23 services20 patients

Initial physician evaluation and management of a diabetic patient with diabetic sensory neuropathy resulting in a loss of protective sensation (lops) which must include: (1) the diagnosis of lops, (2) a patient history, (3) a physical examination that cons G0245

This service involves a doctor assessing a diabetic patient who has lost protective sensation due to diabetic sensory neuropathy. It includes diagnosing this condition, taking a patient's medical history, and conducting a physical exam.

23 services23 patients

X-ray of chest, 1 view 71045

A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.

22 services17 patients

Needle biopsy of thyroid through skin 60100

A needle biopsy of the thyroid through the skin involves inserting a thin needle through your skin and into your thyroid gland to remove a small tissue sample. This sample is then examined under a microscope to identify any abnormal cells. It's a common and safe procedure.

21 services17 patients

Core needle biopsy of lung or center cavity of chest (mediastinum), accessed through skin 32408

A core needle biopsy of the lung or mediastinum is a procedure where a small sample of tissue is collected using a needle inserted through the skin. This helps in diagnosing lung conditions or diseases in the chest's central cavity. It's a safe and minimally invasive process.

20 services19 patients

Ultrasound scan of abdominal aorta 76706

An ultrasound scan of the abdominal aorta is a non-invasive imaging test. It uses sound waves to create pictures of the main blood vessel in your abdomen, the aorta, to check its size and shape. This helps detect any abnormalities or issues early.

19 services19 patients

Injection of substance into lower spine canal using imaging guidance 62323

This procedure involves injecting a substance into your lower spine canal, guided by real-time images. It's done to diagnose or treat various conditions. You may feel slight discomfort, but it's generally safe and can provide valuable information for your treatment plan.

17 services15 patients

Unclassified drugs J3490

Unclassified drugs are medications that don't fit into an existing category or class due to their unique properties or uses. They may be used for various conditions and their effects may differ widely. Always ask your healthcare provider for more information about these drugs.

17 services17 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

16 services16 patients

Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg J0702

This injection contains two medications, betamethasone acetate and betamethasone sodium phosphate. It is used to reduce inflammation and pain. It's given by a healthcare professional, often directly into the area causing discomfort.

16 services14 patients

Ct scan of chest without contrast 71250

A CT scan of the chest without contrast is a non-invasive imaging procedure. It uses special X-ray equipment to produce detailed images of your chest area, including your lungs and heart. It can help diagnose conditions such as lung diseases or heart disorders. It doesn't involve any dyes or contrast agents.

14 services13 patients

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

12 services12 patients

Blood test, basic group of blood chemicals (calcium, ionized) 80047

A basic group of blood chemicals test, including calcium and ionized, is a simple procedure where a small amount of blood is drawn from your arm. This test helps assess your body's overall health and detect potential disorders like kidney disease or bone disease.

12 services12 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Guam Memorial Hospital Authority

Acute Care Hospitals · Tamuning, GU

2/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number650001

Location85O Gov Carlos G Camacho RoadTamuning, GU 96913 · Guam County

Emergency services

Guam Regional Medical City

Acute Care Hospitals · Dededo, GU

OwnershipVoluntary non-profit - Private

CMS Certification Number650003

Location133 Route 3Dededo, GU 96929 · Guam County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 96913 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$92.50 typical visit price

range $60.53 – $180.05

Typical copayment $23.12 (range $15.13 – $45.01)

Most-billed visit code 99203

Established Patient

$74.92 typical visit price

range $20.09 – $147.56

Typical copayment $18.73 (range $5.02 – $36.89)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

88.06/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

87.23

Improvement Activities

Cost

74.73

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. FARAZ OUHADI M.D.

Specialist

633 GOVERNOR CARLOS CAMACHO ROAD, SUITE 305
TAMUNING, GU 96913

Guam (671) 649-7232

DR. ELLEN BEZ MD

Internal Medicine

633 GOVERNOR CARLOS CAMACHO ROAD, SUITE 205
TAMUNING, GU 96913

Guam (671) 649-7232

ASHISH KHANDELWAL MD

Radiology (Diagnostic Radiology)

633 GOVERNOR CARLOS CAMACHO ROAD, SUITE 210
TAMUNING, GU 96913

Guam (671) 649-1001

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Nathaniel Berg's NPI number?

The NPI number for Nathaniel Berg is 1265646806. It was assigned to this individual provider in the NPPES registry on May 10, 2007.

Where is Nathaniel Berg located?

Nathaniel Berg practices at 633 Governor Carlos Camacho Road Suite 210, Tamuning, GU 96913. The listed phone number is (671) 649-1001.

What is Nathaniel Berg's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Vascular & Interventional Radiology, with taxonomy code 2085R0204X.

Is Nathaniel Berg enrolled in Medicare?

Yes. Nathaniel Berg is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Nathaniel Berg's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Berg reassigns Medicare benefits to 4 organizations: Commonwealth Healthcare Corporation (Tinian, MP), Guam Healthcare Development Incorporated (Dededo, GU), Guam Medical Imaging Center LLC (Tamuning, GU) and Guam X-Ray (Tamuning, GU). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nathaniel Berg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Nathaniel Berg affiliated with any hospitals?

According to CMS data, Nathaniel Berg is affiliated with Guam Memorial Hospital Authority and Guam Regional Medical City.

When was this NPI record last updated?

The NPPES record for Nathaniel Berg was last updated on December 9, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.