John Nelson, M.D.
NPI 1225468259 · Family Medicine Physician · Martinez, CA
John Nelson, M.D. is a Family Medicine Physician provider in Martinez, CA (NPI 1225468259).
Provider details
- NPI number
- 1225468259
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 127704 (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
12 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
157 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) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 57 | $160 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 49 | $94 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 35 | $17 |
| Emergency Department Visit With Straightforward Medical Decision Making99282 | 16 | $55 |
Typical Medicare-allowed amounts for these services range $17–$160 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 12 | 12 |
| Naproxen | 12 | — |
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
Registry dates
- Enumerated
- 2013-11-12
- Last updated
- 2013-11-12
Frequently asked questions
- What is John Nelson's NPI number?
- John Nelson's National Provider Identifier (NPI) is 1225468259, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Nelson's specialty?
- John Nelson is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Nelson located?
- John Nelson's practice location on file with NPPES is 2500 Alhambra Ave, Martinez, CA 94553-3156.
- What is John Nelson's phone number?
- The practice phone number listed in the NPPES registry for John Nelson is (925) 370-5000.
- Is John Nelson's NPI active?
- Yes — John Nelson's NPI (1225468259) is active in the NPPES registry as of the last update on 2013-11-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.