DR. GREGORY LEE THALKEN MD
NPI 1861547317
Radiology - Diagnostic Radiology in Long Beach, CA

Q: What is Gregory Thalken's NPI number?

The NPI number for Gregory Thalken is 1861547317. It was assigned to this individual provider in the NPPES registry on January 24, 2007.

Q: What is Gregory Thalken's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Thalken was last updated on May 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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 January 24, 2007PECOS EnrolledAccepts Medicare Assignment

2801 ATLANTIC AVE, LONG BEACH, CA 90806(562) 933-1550 Get Directions Write a Review

NPPES record last updated: May 6, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: May 6, 2026, Apr 24, 2026, Apr 10, 2026 and 5 more (8 updates tracked since 2020).

On this page

About Dr. Gregory Lee Thalken Md NPPES

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

DR. GREGORY LEE THALKEN MD (NPI 1861547317) is an individual diagnostic radiology provider in Long Beach, California, licensed in California (C162624) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS, is affiliated with Temple Health - Chestnut Hill Hospital, and maintains 8 additional practice locations.

NPPES Registry Identity

NPI1861547317

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameDR. GREGORY LEE THALKENCredential: MD

Location Address2801 ATLANTIC AVELong Beach, CA 90806-1701

Mailing Address2801 Atlantic AveLong Beach, CA 90806-1701 · (562) 933-1550

Phone(562) 933-1550

Sole ProprietorNo

Medical School CMSOtherGraduated 2006

Enumeration DateJanuary 24, 2007

Last NPPES UpdateMay 6, 20268 updates tracked since enumeration

NPPES CertifiedMay 6, 2026

✔ NPI 1861547317 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

License✔ Licensed in CA · C162624

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

2801 ATLANTIC AVE, Long Beach, CA 90806

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Secondary Practice Locations 8

Location 1500 Martha Jefferson DrCharlottesville, VA 22911-4668 · Phone (434) 654-7000

Location 26125 Ranier Ln NPlymouth, MN 55446-2072 · Phone (858) 546-3800 · Fax (858) 546-3900

Location 3750 Brunswick AveTrenton, NJ 08638-4143 · Phone (609) 394-6000

Location 4310 Salem Woodstown RdSalem, NJ 08079-2064 · Phone (856) 935-1000

Location 54301 W Markham St # 556Little Rock, AR 72205-7101 · Phone (501) 296-1095 · Fax (501) 526-5919

Location 62010 Health Campus DrRockingham, VA 22801-8679 · Phone (540) 432-8950

Location 74440 W 95th StOak Lawn, IL 60453-2600 · Phone (708) 684-8000 · Fax (708) 520-1039

Location 81 Capital WayPennington, NJ 08534-2520 · Phone (609) 303-4000

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Arkansas Blue Cross and Blue Shield, Blue Cross and Blue Shield of Texas, Blue Cross Blue Shield of Arizona and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregory Lee Thalken 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 ID9830333541

PECOS Enrollment IDI20130919000501, I20190109002556, I20191203001812, I20191205001399, I20200115000214, I20201202001675, I20230329001572, I20230525000848, I20240911000138, I20250825002952, I20260424000167

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.

Areas of Expertise CMS Part B claims 23

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.

1,111 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.

320 services315 patients

Ct scan of blood vessels of head with contrast 70496

A CT scan of the head's blood vessels with contrast is a diagnostic procedure. A special dye (contrast) is injected into your body to make the blood vessels visible on the scan. This helps identify issues like blockages or abnormalities in your head's blood vessels.

216 services214 patients

Ct scan of blood vessels of neck with contrast 70498

A CT scan of the neck's blood vessels with contrast is a diagnostic procedure. It uses X-rays and a special dye to create detailed images of your neck's blood vessels. This helps doctors detect issues such as blockages or abnormalities.

215 services213 patients

Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml A9579

This is an MRI procedure where a gadolinium-based contrast agent is injected into your body. The agent enhances the images, making it easier to detect abnormalities. It's safe and side effects are rare. It's administered per milliliter as needed.

213 services16 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.

134 services128 patients

Ct scan of upper spine without contrast 72125

A CT scan of the upper spine without contrast is a non-invasive imaging test that uses X-rays to capture detailed images of your neck and upper back. It helps in identifying issues like fractures, tumors, or infections. No dye (contrast) is used in this scan.

86 services86 patients

Ct scan of abdomen and pelvis with contrast 74177

A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.

84 services83 patients

Mri scan of brain without contrast 70551

An MRI scan of the brain without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your brain. It helps in detecting abnormalities like tumors, stroke, inflammation, or infection.

64 services64 patients

Ct scan of abdomen and pelvis without contrast 74176

A CT scan of the abdomen and pelvis is a non-invasive medical test. It uses special X-ray equipment to create detailed images of your abdominal and pelvic areas. This helps doctors examine organs, tissues, and vessels. No contrast dye is used in this procedure.

53 services53 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.

47 services47 patients

Ct scan of chest with contrast 71260

A CT scan of the chest with contrast is an imaging procedure. A special dye (contrast) is used to highlight specific areas in your body, providing clearer pictures of your chest. This helps in diagnosing conditions related to your lungs, heart, and other chest structures.

40 services40 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.

37 services37 patients

Computed tomography (ct) of brain blood flow, volume, and timing of flow analysis with contrast 0042T

A computed tomography (CT) of brain blood flow, volume, and timing of flow analysis with contrast is a non-invasive exam. It uses X-rays and a contrast material to create detailed images of your brain. It helps evaluate blood flow patterns and detect abnormalities like clots or blockages.

28 services28 patients

Mri scan of brain without contrast 70551

27 services27 patients

Ct scan head or brain without contrast 70450

23 services23 patients

Ct scan of face without contrast 70486

A CT scan of the face without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your face, including bones, soft tissues, and blood vessels. It's often used to diagnose diseases, injuries, or abnormalities. No contrast dye is used in this procedure.

21 services21 patients

Mri scan of lower spinal canal without contrast 72148

An MRI scan of the lower spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to produce detailed images of your lower spine. This helps identify issues like disc problems, tumors, or nerve conditions. No dye is used.

20 services20 patients

Ct scan of lower spine without contrast 72131

A CT scan of the lower spine without contrast is a non-invasive imaging test. It uses X-rays to create detailed images of your lower back area, helping to detect conditions like fractures, infections, or tumors. It's painless and generally quick.

18 services18 patients

Ct scan of soft tissue of neck with contrast 70491

A CT scan of the neck with contrast is a non-invasive imaging procedure. A special dye is administered to highlight the soft tissues in your neck, making them easier to see. This helps detect issues like infections, tumors, or other abnormalities.

17 services17 patients

Mri scan of brain before and after contrast 70553

An MRI scan of the brain, both before and after contrast, helps visualize different brain structures. Initially, images are taken without a contrast agent. Then, a safe dye is injected which helps highlight certain areas, providing clearer, more detailed images.

16 services16 patients

Ct scan of middle spine without contrast 72128

A CT scan of the middle spine without contrast is a non-invasive imaging test. It uses X-rays to create detailed pictures of your mid-spine area. This scan helps doctors identify issues like fractures, tumors, or infections. No dye is used in this procedure.

12 services12 patients

Mri scan of lower spinal canal without contrast 72148

11 services11 patients

Hospital Affiliations CMS Care Compare

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

Temple Health - Chestnut Hill Hospital

Acute Care Hospitals · Philadelphia, PA

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number390026

Location8835 Germantown AvenuePhiladelphia, PA 19118 · Philadelphia County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90806 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

$96.36 typical visit price

range $62.96 – $187.60

Typical copayment $24.09 (range $15.74 – $46.90)

Most-billed visit code 99203

Established Patient

$77.96 typical visit price

range $20.84 – $153.61

Typical copayment $19.49 (range $5.21 – $38.40)

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.

Other Providers at the Same Location NPPES 20

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

DR. DAVID C KIM M.D.

Pediatrics (Neonatal-Perinatal Medicine)

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 933-8100

MRS. ELISHA MARIE MARTIN MSN, NP

Nurse Practitioner (Acute Care)

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (310) 350-8902

MICHAEL A RAYA MD

Internal Medicine

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 426-3333

GISELLE ABUYUAN GARINGAN PA

Physician Assistant

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 933-2000

ELIZABETH MARY ZAAROUR

Physician Assistant

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 249-4575

LONG BEACH MEMORIAL MEDICAL

Pharmacy (Community/Retail Pharmacy)

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 933-0330

GLENN LEVINE M.D.

Pediatrics (Pediatric Critical Care Medicine)

2801 ATLANTIC AVE, 3RD FLOOR
LONG BEACH, CA 90806

Los Angeles County (562) 933-8743

DAVID KHOA CAO DO

Internal Medicine

2801 ATLANTIC AVE
LONG BEACH, CA 90806

Los Angeles County (562) 426-3333

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 Gregory Thalken's NPI number?

The NPI number for Gregory Thalken is 1861547317. It was assigned to this individual provider in the NPPES registry on January 24, 2007.

Where is Gregory Thalken located?

Gregory Thalken practices at 2801 Atlantic Ave, Long Beach, CA 90806. The listed phone number is (562) 933-1550.

What is Gregory Thalken's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Gregory Thalken enrolled in Medicare?

Yes. Gregory Thalken 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.

What insurance does Gregory Thalken accept?

Health plans from Arkansas Blue Cross and Blue Shield, Blue Cross Blue Shield of Arizona, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Blue Cross Blue Shield of Wyoming and Blue Cross and Blue Shield of Texas and 6 other insurers list Gregory Thalken as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Thalken affiliated with any hospitals?

According to CMS data, Gregory Thalken is affiliated with Temple Health - Chestnut Hill Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Thalken was last updated on May 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.