Marcia C. Peck, MD
Endocrinology, Diabetes & Metabolism Physician · Castro Valley, CA
Marcia C. Peck, MD is an endocrinology, diabetes & metabolism physician with a practice address in Castro Valley, California, and NPI 1376569475, issued on Jul 14, 2006. Check the license (California A75655, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marcia C. Peck
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- A75655 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20130 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 204-2574
- Enumerated
- Jul 14, 2006
- Record last updated
- Mar 11, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (510) 886-8466
- Medicare enrollment
- Enrolled (PECOS I20040122000616); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 20130 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patti Hee, PA-CPhysician Assistant1851439145
- Tony Ho, PA-CPhysician Assistant1013415876
- Louise Hom, M.D.Surgery Physician1649275330
- Donald Knotts, MEDICAL DOCTORInternal Medicine Physician1790858611
Verify Marcia C. Peck in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A75655Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,982 Medicare Part D claims for 293 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Levothyroxine Sodium277 claims
- Atorvastatin Calcium248 claims
- Ozempic215 claims
- Jardiance191 claims
- Metformin Hcl126 claims
- Nano 2nd Gen Pen Needle118 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
- Sutter Bay Medical FoundationOrinda, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcia C. Peck among 1,131 endocrinology, diabetes & metabolism physician records in California
Marcia C. Peck, MD is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2000 · median 2003 among the 779 with a school on file
- Record last updated2011 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Castro Valley → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Amer Budayr, MDCastro Valley, CA 945461700958451
- Jennifer CaseyCastro Valley, CA 945461750524575
- Nalurporn Chokrungvaranon, M.D.Castro Valley, CA 945461922209436
- Samuel Fantaye, MDCastro Valley, CA 945461336677186
- Farnoosh FarrokhiCastro Valley, CA 945461467618454
- Susana Harbutt, M.D.Castro Valley, CA 945461588007678
- Stanley Tan, MDCastro Valley, CA 945461396747721
- Frank Hsu, M.D.Hayward, CA 945411295800365
Common questions
What is Marcia C. Peck, MD's NPI number?
Marcia C. Peck, MD's National Provider Identifier (NPI) is 1376569475, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marcia C. Peck, MD located?
The NPPES record lists a practice address at 20130 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 204-2574. Providers update this record themselves, so call before visiting.
How can I verify Marcia C. Peck, MD's license?
NPPES lists California license number A75655, 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 Marcia C. Peck, MD prescribe under Medicare Part D?
In 2024, Marcia C. Peck, MD had 2,982 Medicare Part D claims for 293 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.