William Nelson Katkov, M.D.
Gastroenterology Physician · Santa Monica, CA
William Nelson Katkov, M.D. is a gastroenterology physician with a practice address in Santa Monica, California, and NPI 1386693646, issued on May 6, 2006. Check the license (California G54468, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Nelson Katkov
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G54468 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2001 Santa Monica Blvd, Santa Monica, CA 90404
- Phone
- (310) 453-1871
- Enumerated
- May 6, 2006
- Record last updated
- Dec 19, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (310) 453-1871
- Medicaid ID
- 00G544680 CA
- Medicare enrollment
- Enrolled (PECOS I20071114000251); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 2001 Santa Monica Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Nelson Katkov in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G54468Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average gastroenterology physician in 2024
686 Medicare Part D claims for 371 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf280 claims
- Omeprazole59 claims
- Pantoprazole Sodium55 claims
- Famotidine38 claims
- Budesonide Ec32 claims
- Mesalamine27 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 85.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $949.86
44 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Cedars-Sinai Medical Care FoundationSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Nelson Katkov among 2,140 gastroenterology physician records in California
William Nelson Katkov, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1983 · median 2002 among the 1,538 with a school on file
- Record last updated2007 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Santa Monica → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Parviz Afshani, M.D.Santa Monica, CA 904041083693766
- Rudolph Bedford, M.D.Santa Monica, CA 904041902885684
- Richard Corlin, M.D.Santa Monica, CA 904041649259268
- Nathan Elson, M.D.Santa Monica, CA 904041750388526
- Charles Frankel, M.D.Santa Monica, CA 904041558310805
- Marc Harwitt, M.D.Santa Monica, CA 904041285613943
- Jerome Helman, MDSanta Monica, CA 904041093876831
- Danice Hertz, M.D.Santa Monica, CA 904041760431027
Common questions
What is William Nelson Katkov, M.D.'s NPI number?
William Nelson Katkov, M.D.'s National Provider Identifier (NPI) is 1386693646, issued on May 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Nelson Katkov, M.D. located?
The NPPES record lists a practice address at 2001 Santa Monica Blvd, Santa Monica, CA, 90404. Phone: (310) 453-1871. Providers update this record themselves, so call before visiting.
How can I verify William Nelson Katkov, M.D.'s license?
NPPES lists California license number G54468, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Nelson Katkov, M.D. prescribe under Medicare Part D?
In 2024, William Nelson Katkov, M.D. had 686 Medicare Part D claims for 371 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is William Nelson Katkov, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.