Corey S. Maas, M.D.
Plastic and Reconstructive Surgery Physician · San Francisco, CA
Corey S. Maas, M.D. is a plastic and reconstructive surgery physician with a practice address in San Francisco, California, and NPI 1851469282, issued on Dec 2, 2006. Check the license (California G71163, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Corey S. Maas
- Credential
- M.D.
- Primary taxonomy
- Plastic and Reconstructive Surgery Physician 2086S0122X
- License number
- G71163 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2400 Clay St, San Francisco, CA 94115
- Phone
- (415) 567-7000
- Enumerated
- Dec 2, 2006
- Record last updated
- Mar 24, 2026
- Fax
- (415) 567-7011
- Entity
- Type 1 · individual
8 nearest plastic and reconstructive surgery physician records → All 359 in California → Look up another NPI →
Also registered at 2400 Clay St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jason Azzi, MDFacial Plastic Surgery Physician1942199351
- Jason Champagne, M.D.Otolaryngology/Facial Plastic Surgery Physician1821219270
- Rani Spudich, M.D.General Practice Physician1033309398
Verify Corey S. Maas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G71163Check 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% fewer Medicare Part D claims than the average plastic and reconstructive surgery physician in 2024
85 Medicare Part D claims for 29 beneficiaries, against an average of 93 among the 1,895 providers of this specialty who prescribed in Part D.
Most prescribed
- Spironolactone33 claims
- Minoxidil21 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.
Industry payments in 2024: $24,250.37
25 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 2,042 providers of this specialty with any payment received $2,814.09 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.
Corey S. Maas among 359 plastic and reconstructive surgery physician records in California
Corey S. Maas, M.D. is one of 359 plastic and reconstructive surgery physician records with a practice address in California. 76% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 60% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 40% of these records are
- Record last updated2026 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086S0122X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Plastic and Reconstructive Surgery Physician providers in California
There are 359 plastic and reconstructive surgery physician records in California.
All 359 in California → Every provider in San Francisco → Plastic and Reconstructive Surgery Physician nationwide →
The 8 plastic and reconstructive surgery physician records with the nearest ZIP codes
- Carolyn Chang, MDSan Francisco, CA 941151598826745
- Loren Eskenazi, MDSan Francisco, CA 941151578624714
- Thomas Satterwhite, MDSan Francisco, CA 941151871789826
- Alice Woo, M.D.San Francisco, CA 941151922261247
- Gregory Buncke, MDSan Francisco, CA 941141396736633
- Rudolf Buntic, MDSan Francisco, CA 941141497745202
- Avinash Islur, M.D.San Francisco, CA 941141225223324
- Ognjen (ogi) Solaja, MDSan Francisco, CA 941141437839925
Common questions
What is Corey S. Maas, M.D.'s NPI number?
Corey S. Maas, M.D.'s National Provider Identifier (NPI) is 1851469282, issued on Dec 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Corey S. Maas, M.D. located?
The NPPES record lists a practice address at 2400 Clay St, San Francisco, CA, 94115. Phone: (415) 567-7000. Providers update this record themselves, so call before visiting.
How can I verify Corey S. Maas, M.D.'s license?
NPPES lists California license number G71163, 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 Corey S. Maas, M.D. prescribe under Medicare Part D?
In 2024, Corey S. Maas, M.D. had 85 Medicare Part D claims for 29 beneficiaries; the average among plastic and reconstructive surgery physician prescribers was 93. Part D covers Medicare prescriptions only.
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.