Marcia Peck, MD
NPI 1376569475 · Endocrinology, Diabetes & Metabolism Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcia Peck, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Castro Valley, CA (NPI 1376569475).
Provider details
- NPI number
- 1376569475
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A75655 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,064 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 434 | $153 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 407 | $19 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 387 | $212 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 337 | $39 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 242 | $129 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 277 | 75 |
| Atorvastatin Calcium | 248 | 85 |
| Semaglutidebrand: Ozempic | 215 | 46 |
| Empagliflozinbrand: Jardiance | 191 | 57 |
| Metformin Hcl | 126 | 37 |
| Pen Needle, Diabeticbrand: Nano 2nd Gen Pen Needle | 118 | 52 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-14
- Last updated
- 2011-03-11
Frequently asked questions
- What is Marcia Peck's NPI number?
- Marcia Peck's National Provider Identifier (NPI) is 1376569475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcia Peck's specialty?
- Marcia Peck is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Marcia Peck located?
- Marcia Peck's practice location on file with NPPES is 20130 Lake Chabot Rd, Castro Valley, CA 94546-5340.
- What is Marcia Peck's phone number?
- The practice phone number listed in the NPPES registry for Marcia Peck is (510) 204-2574.
- Does Marcia Peck accept Medicare?
- Marcia Peck is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcia Peck's NPI active?
- Yes — Marcia Peck's NPI (1376569475) is active in the NPPES registry as of the last update on 2011-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.