Peter Nelken, NP, ANP-BC
NPI 1538431804 · Adult Health Nurse Practitioner · San Francisco, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Nelken, NP, ANP-BC is a Adult Health Nurse Practitioner provider in San Francisco, CA (NPI 1538431804).
Provider details
- NPI number
- 1538431804
- Entity type
- Individual
- Primary specialty
- Adult Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP, ANP-BC
- Sex
- Male
- Sole proprietor
- No
- License
- 707667 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 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
21 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) |
|---|---|---|
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 21 | $108 |
Typical Medicare-allowed amounts for these services range $108–$108 (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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 23 | 23 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 23 | — |
| Nifedipinebrand: Nifedipine Er | 18 | — |
| Omeprazole | 18 | — |
| Prednisone | 18 | — |
| Atovaquone | 12 | — |
| Fluconazole | 12 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-02-02
- Last updated
- 2012-02-02
Frequently asked questions
- What is Peter Nelken's NPI number?
- Peter Nelken's National Provider Identifier (NPI) is 1538431804, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Nelken's specialty?
- Peter Nelken is listed in the NPPES registry with a primary specialty of Adult Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Peter Nelken located?
- Peter Nelken's practice location on file with NPPES is 505 Parnassus Ave, San Francisco, CA 94143-2204.
- What is Peter Nelken's phone number?
- The practice phone number listed in the NPPES registry for Peter Nelken is (415) 353-1387.
- Does Peter Nelken accept Medicare?
- Peter Nelken is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Nelken's NPI active?
- Yes — Peter Nelken's NPI (1538431804) is active in the NPPES registry as of the last update on 2012-02-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.