Darby Annette Clayson, MD
Internal Medicine Physician · San Francisco, CA
Darby Annette Clayson, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1619968021, issued on Nov 3, 2005. Check the license (California A139455, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Darby Annette Clayson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A139455 CA
11502 NV
Self-reported in NPPES; status is on the state search - Practice location
- 1575 7TH Ave, San Francisco, CA 94122
- Phone
- (702) 453-3799
- Enumerated
- Nov 3, 2005
- Record last updated
- Feb 27, 2026
- Fax
- (702) 453-5741
- Medicare enrollment
- Enrolled (PECOS I20160323000586); may accept Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1998
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1575 7TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Darby Annette Clayson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139455Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average internal medicine physician in 2024
3,474 Medicare Part D claims for 201 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 46 claims were for opioids.
Most prescribed
- Atorvastatin Calcium253 claims
- Amlodipine Besylate216 claims
- Eliquis152 claims
- Levothyroxine Sodium133 claims
- Furosemide125 claims
- Lisinopril111 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): 72 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: $129.41
1 payment: food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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 2 group practices
- San Francisco Unified Physicians Group, IncSan Francisco, CA
- Vituity Hospitalists PCSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Darby Annette Clayson among 17,696 internal medicine physician records in California
Darby Annette Clayson, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1998 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Jessica Glassman, MDSan Francisco, CA 941221184798795
- Kirsten Marcus, M.D.San Francisco, CA 941221992995435
- Christopher Ng, MDSan Francisco, CA 941221063429900
- Pyone Wai Wai Soe, M.D.San Francisco, CA 941221124379656
- Sansan Tin, MDSan Francisco, CA 941221396779450
Common questions
What is Darby Annette Clayson, MD's NPI number?
Darby Annette Clayson, MD's National Provider Identifier (NPI) is 1619968021, issued on Nov 3, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Darby Annette Clayson, MD located?
The NPPES record lists a practice address at 1575 7TH Ave, San Francisco, CA, 94122. Phone: (702) 453-3799. Providers update this record themselves, so call before visiting.
How can I verify Darby Annette Clayson, MD's license?
NPPES lists California license number A139455, 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 Darby Annette Clayson, MD prescribe under Medicare Part D?
In 2024, Darby Annette Clayson, MD had 3,474 Medicare Part D claims for 201 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Darby Annette Clayson, MD's MIPS final score?
The 2023 MIPS final score is 72 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.