Samuel Marcus, M.D.
NPI 1396717740 · Gastroenterology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Samuel Marcus, M.D. is a Gastroenterology Physician provider in Stanford, CA (NPI 1396717740).
Provider details
- NPI number
- 1396717740
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A50154 (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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
706 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 | 220 | $148 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 153 | $212 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 81 | $105 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 61 | $125 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 53 | $171 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 113 | 40 |
| Omeprazole | 92 | 40 |
| Mesalamine | 27 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 21 | 20 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 2490 Hospital DrSuite 211Mountain View, CA 94040Phone: (650) 988-7488Fax: (650) 988-7486
Registry dates
- Enumerated
- 2006-02-01
- Last updated
- 2024-04-15
- Certified
- 2024-04-15
Frequently asked questions
- What is Samuel Marcus's NPI number?
- Samuel Marcus's National Provider Identifier (NPI) is 1396717740, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Samuel Marcus's specialty?
- Samuel Marcus is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Samuel Marcus located?
- Samuel Marcus's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Samuel Marcus's phone number?
- The practice phone number listed in the NPPES registry for Samuel Marcus is (650) 723-4000.
- Does Samuel Marcus accept Medicare?
- Samuel Marcus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Samuel Marcus's NPI active?
- Yes — Samuel Marcus's NPI (1396717740) is active in the NPPES registry as of the last update on 2024-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.