Caroline Elizabeth Barnhart, MD
Obstetrics & Gynecology Physician · Petaluma, CA
Caroline Elizabeth Barnhart, MD is an obstetrics & gynecology physician with a practice address in Petaluma, California, and NPI 1437618774, issued on Mar 16, 2019. Check the license (California A181568, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Caroline Elizabeth Barnhart
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A181568 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3900 Lakeville Hwy, Petaluma, CA 94954
- Phone
- (707) 765-3900
- Enumerated
- Mar 16, 2019
- Record last updated
- Nov 29, 2023
- Medicare enrollment
- Enrolled (PECOS I20231208003344); may accept Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 2019
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 3900 Lakeville Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Matthew AndersonPharmacist1336673110
- Suzanne Aoyagi, PHARMDPharmacist1497289268
- John Arden, PHDPsychologist1841351053
- Alexis Becker, CNMMidwife1225112584
- Sharina Belani, MDInternal Medicine Physician1700958550
- Lisa Bell, P.T.Physical Therapist1619021409
Verify Caroline Elizabeth Barnhart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A181568Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
194 Medicare Part D claims for 96 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Estradiol31 claims
- Clobetasol Propionate30 claims
- Yuvafem30 claims
- Acyclovir16 claims
- Progesterone13 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 one group practice
- Regents Univ OF California UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caroline Elizabeth Barnhart among 5,088 obstetrics & gynecology physician records in California
Caroline Elizabeth Barnhart, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 92% of them.
- NPI issued2019 · 92% of these records are older, 6% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2019 · median 2004 among the 2,700 with a school on file
- Record last updated2023 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Petaluma → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Julie Clark, MDPetaluma, CA 949541346216389
- Kellie Corcoran, MDPetaluma, CA 949541760817258
- Laurie Dibble, MDPetaluma, CA 949541487738555
- Anthony Kosinski, M.D.Petaluma, CA 949541588656631
- Elmira Manoucheri, M.D.Petaluma, CA 949541942475710
- Bonni Massa, M.D.Petaluma, CA 949541508933607
- Judith McCarthy, MDPetaluma, CA 949541770667750
- Fiona Redwood, M.D.Petaluma, CA 949541255323945
Common questions
What is Caroline Elizabeth Barnhart, MD's NPI number?
Caroline Elizabeth Barnhart, MD's National Provider Identifier (NPI) is 1437618774, issued on Mar 16, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Caroline Elizabeth Barnhart, MD located?
The NPPES record lists a practice address at 3900 Lakeville Hwy, Petaluma, CA, 94954. Phone: (707) 765-3900. Providers update this record themselves, so call before visiting.
How can I verify Caroline Elizabeth Barnhart, MD's license?
NPPES lists California license number A181568, 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 Caroline Elizabeth Barnhart, MD prescribe under Medicare Part D?
In 2024, Caroline Elizabeth Barnhart, MD had 194 Medicare Part D claims for 96 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.