Mark Singer, M.D.
NPI 1962486332 · Internal Medicine Physician · Napa, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Singer, M.D. is a Internal Medicine Physician provider in Napa, CA (NPI 1962486332).
Provider details
- NPI number
- 1962486332
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- CAG539243 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,088 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) |
|---|---|---|
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 462 | $138 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 176 | $82 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 119 | $197 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 88 | $96 |
| Advance Care Planning, First 30 Minutes99497 | 62 | $90 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 79 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 220 | 41 |
| Apixabanbrand: Eliquis | 171 | 36 |
| Atorvastatin Calcium | 142 | 38 |
| Gabapentin | 107 | 29 |
| Trazodone Hcl | 106 | 27 |
| Furosemide | 98 | 22 |
| Escitalopram Oxalate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-30
- Last updated
- 2010-07-12
Frequently asked questions
- What is Mark Singer's NPI number?
- Mark Singer's National Provider Identifier (NPI) is 1962486332, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Singer's specialty?
- Mark Singer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Singer located?
- Mark Singer's practice location on file with NPPES is 3334 Sterling Ct, Napa, CA 94558-4262.
- What is Mark Singer's phone number?
- The practice phone number listed in the NPPES registry for Mark Singer is (707) 365-5151.
- Does Mark Singer accept Medicare?
- Mark Singer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Singer's NPI active?
- Yes — Mark Singer's NPI (1962486332) is active in the NPPES registry as of the last update on 2010-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.