Marc Shapiro, MD
NPI 1740217348 · Internal Medicine Physician · Clearlake, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Shapiro, MD is a Internal Medicine Physician provider in Clearlake, CA (NPI 1740217348).
Provider details
- NPI number
- 1740217348
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G343590 (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
108 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 108 | $8 |
Typical Medicare-allowed amounts for these services range $8–$8 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-27
- Last updated
- 2009-08-28
Frequently asked questions
- What is Marc Shapiro's NPI number?
- Marc Shapiro's National Provider Identifier (NPI) is 1740217348, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Shapiro's specialty?
- Marc Shapiro is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Shapiro located?
- Marc Shapiro's practice location on file with NPPES is 3400 Emerson St, Clearlake, CA 95422-9529.
- What is Marc Shapiro's phone number?
- The practice phone number listed in the NPPES registry for Marc Shapiro is (707) 994-7241.
- Does Marc Shapiro accept Medicare?
- Marc Shapiro is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Shapiro's NPI active?
- Yes — Marc Shapiro's NPI (1740217348) is active in the NPPES registry as of the last update on 2009-08-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.