Celina Allyn Mercer, MD
Family Medicine Physician · Petaluma, CA
Celina Allyn Mercer, MD is a family medicine physician with a practice address in Petaluma, California, and NPI 1245850585, issued on Apr 16, 2020. Check the license (California A183797, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Celina Allyn Mercer
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A183797 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1179 N Mcdowell Blvd, Petaluma, CA 94954
- Phone
- (707) 559-7500
- Enumerated
- Apr 16, 2020
- Record last updated
- Feb 7, 2025
- Medicare enrollment
- Enrolled (PECOS I20230718001969); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2020
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1179 N Mcdowell Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Celina Allyn Mercer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A183797Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
147 Medicare Part D claims for 47 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium24 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.
Bills Medicare through 2 group practices
- Coastal Health AlliancePoint Reyes Station, CA
- Petaluma Health Center IncPetaluma, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Celina Allyn Mercer among 17,133 family medicine physician records in California
Celina Allyn Mercer, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 88% of them.
- NPI issued2020 · 88% of these records are older, 9% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2020 · median 2005 among the 10,652 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
46 family medicine physician records list a practice address in Petaluma
They are 46 of the 1,856 NPPES records with a practice address in Petaluma, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Petaluma → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Andrew Ashcroft, M.D.Petaluma, CA 949541053306795
- Richard Chen, MDPetaluma, CA 949541285602573
- Jonathan Choe, M.D.Petaluma, CA 949541518959170
- Michelle Davey, DOPetaluma, CA 949541366445785
- Patrick Flynn, M.D.Petaluma, CA 949541770567745
- Colleen Foy Sterling, M.D.Petaluma, CA 949541619969326
- Robert Hentz, MDPetaluma, CA 949541720012107
- Audra Lehman, M.D.Petaluma, CA 949541063404762
Common questions
What is Celina Allyn Mercer, MD's NPI number?
Celina Allyn Mercer, MD's National Provider Identifier (NPI) is 1245850585, issued on Apr 16, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Celina Allyn Mercer, MD located?
The NPPES record lists a practice address at 1179 N Mcdowell Blvd, Petaluma, CA, 94954. Phone: (707) 559-7500. Providers update this record themselves, so call before visiting.
How can I verify Celina Allyn Mercer, MD's license?
NPPES lists California license number A183797, 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 Celina Allyn Mercer, MD prescribe under Medicare Part D?
In 2024, Celina Allyn Mercer, MD had 147 Medicare Part D claims for 47 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.