HYUNJOONG WILLIAM KIM MD
NPI 1710478250
Radiology - Diagnostic Radiology in San Francisco, CA

Q: What is Hyunjoong Kim's NPI number?

The NPI number for Hyunjoong Kim is 1710478250. It was assigned to this individual provider in the NPPES registry on May 21, 2018.

Q: What is Hyunjoong Kim'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 Hyunjoong Kim was last updated on March 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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 21, 2018PECOS EnrolledAccepts Medicare Assignment

91.85/100

CMS Quality Rating

1001 POTRERO AVENUE, BLDG. 5, 1ST FL., SAN FRANCISCO, CA 94110(628) 206-8020 Get Directions Write a Review

NPPES record last updated: March 21, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 30, 2023, Mar 1, 2023, May 21, 2018 (3 updates tracked since 2018).

On this page

About Hyunjoong William Kim Md NPPES

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

HYUNJOONG WILLIAM KIM MD (NPI 1710478250) is an individual diagnostic radiology provider in San Francisco, California, licensed in California (A185835) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Boston University School Of Medicine (2018).

NPPES Registry Identity

NPI1710478250

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameHYUNJOONG WILLIAM KIMCredential: MD

Location Address1001 POTRERO AVENUE, BLDG. 5, 1ST FL.San Francisco, CA 94110

Mailing Address1001 Potrero Avenue, Bldg. 5, 1st Fl.San Francisco, CA 94110

Phone(628) 206-8020

Sole ProprietorNo

Medical School CMSBoston University School Of MedicineGraduated 2018

Enumeration DateMay 21, 2018

Last NPPES UpdateMarch 21, 20243 updates tracked since enumeration

NPPES CertifiedMarch 21, 2024

✔ NPI 1710478250 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

Licenses✔ Licensed in CA · A185835✔ Licensed in NY · 304704

Definition

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

Also ListedInternal MedicineTaxonomy 207R00000X · License MT215077 (PA)

1001 POTRERO AVENUE, San Francisco, CA 94110

Open in Google Maps ↗

Secondary Practice Locations 2

Location 1622 W 168th StNew York, NY 10032-3720 · Phone (212) 305-4928

Location 21101 Van Ness Ave Fl 3San Francisco, CA 94109-6919 · Phone (415) 600-3232 · Fax (415) 447-6335

Other Identifiers 2

Medicaid100380268CA

Other532689CA · Anthem Blue Cross

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

Hyunjoong William Kim 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 ID8123356797

PECOS Enrollment IDI20230530000965

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 Hyunjoong Kim reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of California Sfgh Medical Group

Same address

Diagnostic Radiology

1001 POTRERO AVENUE BLDG 5, 1ST FL
San Francisco, CA 94110

Reassigned Medicare billing, California enrollment
336 clinicians in this Medicare group

NPI 1063487122 (628) 206-5871

California Advanced Imaging Medical Associates Inc

2.3 mi

Diagnostic Radiology

1101 VAN NESS AVE
San Francisco, CA 94109

Reassigned Medicare billing, California enrollment
96 clinicians in this Medicare group

NPI 1881646909 (415) 600-6000

University Of California San Francisco

3.0 mi

Surgery

400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143

Reassigned Medicare billing, California enrollment
5,645 clinicians in this Medicare group

NPI 1346329380 (415) 353-2161

Ucsf Medical Group Business Services

3.0 mi

Internal Medicine

400 PARNASSUS AVE
San Francisco, CA 94122

Reassigned Medicare billing, California enrollment
5,544 clinicians in this Medicare group

NPI 1477624104 (415) 353-2808

Sutter Bay Medical Foundation

15 mi

Multi-Specialty

12 CAMINO ENCINAS
Orinda, CA 94563

Reassigned Medicare billing, California enrollment
4,479 clinicians in this Medicare group

NPI 1366898538 (510) 204-8180

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 40

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.

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.

442 services345 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.

202 services195 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.

122 services119 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.

90 services87 patients

X-ray for bone length assessment 77073

An X-ray for bone length assessment is a simple, non-invasive imaging test. It helps to evaluate the length of your bones and identify any discrepancies or abnormalities. This procedure is quick, painless, and provides valuable information for your healthcare provider.

85 services85 patients

X-ray of abdomen, 1 view 74018

An X-ray of the abdomen, 1 view, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the structures in your abdomen, such as the stomach, liver, and intestines. This can help identify issues like blockages, infections, or injuries.

83 services64 patients

3d radiographic procedure with computerized image postprocessing 76377

A 3D radiographic procedure with computerized image postprocessing is a high-tech imaging test. It uses X-rays to create detailed 3D images of the body. The computerized postprocessing further enhances these images for more precise diagnosis and treatment planning.

83 services83 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.

70 services69 patients

Mri scan of abdomen before and after contrast 74183

An MRI scan of the abdomen before and after contrast provides detailed images of your abdominal organs. Initially, images are taken without a contrast agent. Then, a safe dye is administered, usually via an IV, to highlight certain areas, giving a clearer picture to help diagnose various conditions.

66 services63 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.

65 services64 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.

64 services64 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.

57 services56 patients

X-ray of entire middle and lower spine, 2-3 views 72082

An X-ray of your middle and lower spine involves capturing images of these areas to identify any abnormalities. The procedure involves taking 2-3 different views for a comprehensive understanding. It's non-invasive and usually painless, helping doctors diagnose conditions like fractures or infections.

56 services55 patients

X-ray of lower and sacral spine, 2-3 views 72100

An X-ray of the lower and sacral spine involves capturing images of your lower back area, including the tailbone. This procedure helps in identifying problems like fractures, infections, or deformities. 2-3 different angle views provide a comprehensive picture.

56 services54 patients

Complete ultrasound scan of abdomen 76700

A complete ultrasound scan of the abdomen is a non-invasive imaging procedure. It uses sound waves to produce images of the organs in your abdomen, such as the liver, gallbladder, spleen, pancreas, and kidneys. It helps in diagnosing, monitoring, and planning treatments.

46 services46 patients

Complete ultrasound scan behind abdominal cavity 76770

A complete ultrasound scan behind the abdominal cavity is a non-invasive imaging procedure. It uses sound waves to create pictures of the structures and organs located at the back of your abdomen. It helps in diagnosing health conditions and monitoring ongoing treatments.

44 services44 patients

X-ray of upper spine, 2-3 views 72040

An X-ray of the upper spine, with 2-3 views, is a painless procedure that employs a small amount of radiation to capture images of your neck and upper back. It assists in diagnosing conditions like arthritis, fractures, or spinal deformities.

43 services42 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.

39 services39 patients

Mri scan of pelvis before and after contrast 72197

An MRI scan of the pelvis before and after contrast is a non-invasive imaging technique. It uses magnetic fields and radio waves to capture detailed images of your lower abdomen. Contrast dye, safe for the body, improves image clarity. This helps detect abnormalities more accurately.

38 services38 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.

35 services35 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.

30 services30 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.

30 services30 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

29 services27 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

29 services16 patients

X-ray of knee, 4 or more views 73564

An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.

28 services18 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.

28 services28 patients

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

26 services22 patients

X-ray of entire middle and lower spine, minimum of 6 views 72084

This procedure involves taking a series of X-ray images, at least six, of your middle and lower spine. It helps to identify any abnormalities or issues such as fractures, infections, or tumors. You'll be asked to stay still while the machine captures the images. It's quick and painless.

24 services24 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

24 services24 patients

X-ray of knee, 1-2 views 73560

An X-ray of the knee with 1-2 views is a quick, painless test that produces images of the knee bones. It helps identify fractures, infections, or changes in the knee joint. During the procedure, you'll be asked to stay still while the X-ray machine captures the images.

20 services16 patients

Ct scan of blood vessels of abdomen and pelvis with contrast 74174

A CT scan of the abdomen and pelvis with contrast is a medical imaging procedure. A special dye, called contrast, is used to make blood vessels more visible. The scan produces detailed images of your abdomen and pelvis, helping doctors to diagnose conditions or plan treatments.

20 services20 patients

Ct scan of abdomen before and after contrast 74170

A CT scan of the abdomen before and after contrast is a diagnostic procedure. It involves taking detailed images of your abdomen area. Initially, images are taken without a contrast agent. Then, a contrast dye is given to highlight specific areas inside your body, helping to provide clearer images for better diagnosis.

19 services18 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.

18 services18 patients

Complete ultrasound of abdomen and pelvis artery and vein blood flow 93975

This procedure uses sound waves to create images of your abdomen and pelvis, specifically focusing on the arteries and veins. It helps in assessing the blood flow and detecting any abnormalities, ensuring your overall well-being.

18 services17 patients

Ct guidance for insertion of radiation therapy fields 77014

CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.

17 services17 patients

Mri scan of abdomen without contrast 74181

An MRI scan of the abdomen without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed pictures of your abdominal organs. This procedure doesn't involve radiation or dye injection.

16 services16 patients

X-ray of upper spine, 4-5 views 72050

An X-ray of the upper spine with 4-5 views is a non-invasive imaging test. It uses radiation to capture detailed images of the bones and structures in your neck and upper back. This procedure helps identify issues like fractures, infections, or deformities.

15 services15 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.

13 services13 patients

Ct scan of pelvis without contrast 72192

A CT scan of the pelvis without contrast is a non-invasive imaging test. It uses X-rays to create detailed pictures of your lower abdomen area. It helps in detecting issues like injuries, inflammation, or abnormal growths. It doesn't involve any dye injection.

12 services12 patients

X-ray of hand, minimum of 3 views 73130

An X-ray of the hand, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones in your hand from different angles. This helps in diagnosing fractures, infections, arthritis, or other abnormalities. It's quick and painless.

12 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94110 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

$104.51 typical visit price

range $69.00 – $202.35

Typical copayment $26.12 (range $17.25 – $50.58)

Most-billed visit code 99203

Established Patient

$84.91 typical visit price

range $23.44 – $166.46

Typical copayment $21.22 (range $5.86 – $41.61)

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.

91.85/100

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

Scored as part of a group practice

Quality

83.53

Promoting Interoperability

100

Improvement Activities

Cost

68.01

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.

PWINT PHYU KHINE D.O.

Radiology (Diagnostic Radiology)

1001 POTRERO AVENUE, BLDG. 5, 1ST FLOOR
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8020

JOYCE SESE DORADO PH D

Psychologist (Clinical)

1001 POTRERO AVENUE, RM 7M
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5612

CITY AND COUNY OF SAN FRANCISCO

Nuclear Medicine

1001 POTRERO AVENUE, RM G100
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-8580

URMIMALA SARKAR MD

Internal Medicine

1001 POTRERO AVENUE, RM 5H22
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-8317

RENA MEI MD

Internal Medicine (Gastroenterology)

1001 POTRERO AVENUE, BUILDING 5, 3RD FLOOR, SUITE 3D
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8823

MICHAEL HARRINGTON HUMPHREYS MD

Internal Medicine

1001 POTRERO AVENUE, BLDG 100 RM 350
SAN FRANCISCO, CA 94110

San Francisco County (415) 476-4617

LLOYD JOSEPH KING MD

Psychiatry & Neurology (Psychiatry)

1001 POTRERO AVENUE, RM 7M
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5612

DR. HARINI SARATHY MBBS

Internal Medicine (Nephrology)

1001 POTRERO AVENUE, WARD 17 DIALYSIS CLINIC, BLDG. 100, 3RD FL.
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8242

FEROZ RAHMAN PAPA MD

Internal Medicine

1001 POTRERO AVENUE, BLDG 30 RM 3501K
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-4615

ZAINAB FARZAL M.D.

Otolaryngology

1001 POTRERO AVENUE, BLDG. 5, #4M
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-5476

PAUL RUHR LINDE MD

Psychiatry & Neurology (Psychiatry)

1001 POTRERO AVENUE, RM 7M
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5612

GLORIA SUE

Plastic Surgery

1001 POTRERO AVENUE, BUILDING 5, #3M
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8814

KIRA LEVY M.D.

Family Medicine

1001 POTRERO AVENUE, BUILDING 80-83
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5252

RAYMOND KIBBE MEISTER MD

Preventive Medicine (Occupational Medicine)

1001 POTRERO AVENUE, BLDG 30 5TH FLOOR
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5200

KAZIM H. NARSINH M.D.

Radiology (Vascular & Interventional Radiology)

1001 POTRERO AVENUE, BLDG. 5, 1ST FL.
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8020

PATRICK AVILA

Internal Medicine (Gastroenterology)

1001 POTRERO AVENUE, BLDG. 5, 3D
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-8823

CINDY FAYE BELEW CNM NP

Registered Nurse

1001 POTRERO AVENUE, RM 6D14
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-5679

MARY OMALLEY GRAY MD

Internal Medicine (Cardiovascular Disease)

1001 POTRERO AVENUE, RM 5G1
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-3503

AMANDA SUE CARLISLE MD

Anesthesiology

1001 POTRERO AVENUE, RM 2A21
SAN FRANCISCO, CA 94110

San Francisco County (415) 206-8509

DR. MEI ZHU PENG M.D.

Internal Medicine (Nephrology)

1001 POTRERO AVENUE, BLDG. 90, 2ND FL
SAN FRANCISCO, CA 94110

San Francisco County (628) 206-4777

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 Hyunjoong Kim's NPI number?

The NPI number for Hyunjoong Kim is 1710478250. It was assigned to this individual provider in the NPPES registry on May 21, 2018.

Where is Hyunjoong Kim located?

Hyunjoong Kim practices at 1001 Potrero Avenue Bldg. 5, 1st Fl., San Francisco, CA 94110. The listed phone number is (628) 206-8020.

What is Hyunjoong Kim's specialty?

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

Is Hyunjoong Kim enrolled in Medicare?

Yes. Hyunjoong Kim 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 Hyunjoong Kim's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hyunjoong Kim reassigns Medicare benefits to 5 organizations: University Of California Sfgh Medical Group (San Francisco, CA), California Advanced Imaging Medical Associates Inc (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Sutter Bay Medical Foundation (Orinda, CA). 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 Hyunjoong Kim's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Hyunjoong Kim was last updated on March 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.