NPI registry status
Active
2026 NPPES data Orthopedic Registered Nurse NPI 1538431804 NP, ANP-BC
Verify on CMS → Peter Nelken, NP, ANP-BC
Orthopedic Registered Nurse in San Francisco, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 289 in Orthopedic Registered Nurse, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
218
Medicare Part D claims · 67 beneficiaries · Orthopedic Registered Nurse avg: 635
MIPS score
75/100
CMS neutral threshold · no category scores published
What the federal data shows
Peter Nelken, NP, ANP-BC carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 218 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 218
- Part D claims, 2024
- ≥48th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Peter Nelken, NP, ANP-BC
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1538431804), first enumerated 02/02/2012.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 218 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Peter Nelken, NP, ANP-BC's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1538431804 · Orthopedic Registered Nurse
NPI-10 · ENUM-MID · TAX-TRACE · MIPS-NEUTRAL · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1538431804
- ENUM-MID 2012
- TAX-TRACE 289
- MIPS-NEUTRAL 75/100
- RX-LIGHT 218
- BOOK-THIN 18 in California
- PHOTO-ENUM Analissa Chavez, MS,… · 2012
Peter Nelken, NP, ANP-BC's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
218 ≥ 48th percentile 48% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Peter Nelken, NP, ANP-BC?
CMS neutral score, not measuredPrimary specialty
Orthopedic Registered Nurse
Medicare Part D claims
218 66% vs specialty avg
MIPS final score
75/100
Specialty distribution in California
How Orthopedic Registered Nurse compares to other specialties among California providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1538431804 |
|---|---|
| Specialty | Orthopedic Registered Nurse |
| Credentials | NP, ANP-BC |
| Gender | Male |
| NPI Issued | 02/02/2012 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Group practice
Hospital and facility affiliations
Facilities where Peter Nelken, NP, ANP-BC bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Ucsf Medical Group Business Services
San Francisco, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Peter Nelken, NP, ANP-BC. To verify Peter Nelken, NP, ANP-BC's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
218
Total Claims
$24K
Total Drug Cost
67
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 268.233
- Total Day Supply
- 6,657
- Generic Drug Cost
- $15K
- Opioid Claims
- 23 (10.6% rate)
- Antibiotic Claims
- 39
Patient Demographics
- Average Patient Age
- 56.7 years
- Avg HCC Risk Score
- 8.42
- Gender Split
- 46% female / 54% male
- Age Distribution
- <65: 41, 65-74: 23, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Peter Nelken, NP, ANP-BC prescribes most
Top Medicare Part D drugs by claim count, 2024
- Oxycodone Hcl
Oxycodone Hcl
23 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
23 claims
- Nifedipine Er
Nifedipine Er
18 claims
- Omeprazole
Omeprazole
18 claims
- Prednisone
Prednisone
18 claims
- Atovaquone
Atovaquone
12 claims
- Fluconazole
Fluconazole
12 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 23 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 23 |
| Nifedipine Er Nifedipine | 18 |
| Omeprazole | 18 |
| Prednisone | 18 |
| Atovaquone | 12 |
| Fluconazole | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Orthopedic Registered Nurse Overview
How Peter Nelken, NP, ANP-BC fits within the Orthopedic Registered Nurse landscape nationally.
289
Orthopedic Registered Nurse Providers in US
48
States with Orthopedic Registered Nurse
635
Avg Claims per Provider
Peter Nelken, NP, ANP-BC's 218 claims are below the specialty average of 635.
Nationwide Orthopedic Registered Nurse peers with similar MIPS or enrollment year
Two federal-record peer sets for Nelken, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2012)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Orthopedic Registered Nurse Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nelken.
One of 18 Orthopedic Registered Nurse providers enrolled in California, 5 are shown here.
Michael Brislin
RN
Spring Valley, CA
Stacy Cox
RN
Oceanside, CA
Frank Dibisceglie
RN
Glendale, CA
Jason Florendo
RNFA
Irvine, CA
Ma Theresa Ge
NP
Irvine, CA
Compare Orthopedic Registered Nurse nationally: see state-by-state distribution →
Frequently Asked Questions
What is Peter Nelken, NP, ANP-BC's specialty? ▼
Peter Nelken, NP, ANP-BC specializes in Orthopedic Registered Nurse and practices in San Francisco, California. Credentials: NP, ANP-BC.
How much does Peter Nelken, NP, ANP-BC prescribe under Medicare Part D? ▼
In 2024, Peter Nelken, NP, ANP-BC wrote 218 Medicare Part D claims totaling $24K in drug costs for 67 beneficiaries.
What is Peter Nelken, NP, ANP-BC's Medicare quality score? ▼
Peter Nelken, NP, ANP-BC has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Peter Nelken, NP, ANP-BC located? ▼
Peter Nelken, NP, ANP-BC is located at 505 PARNASSUS AVE, San Francisco, CA, 94143. Phone: (415) 353-1387.
What is Peter Nelken, NP, ANP-BC's NPI number? ▼
Peter Nelken, NP, ANP-BC's National Provider Identifier (NPI) is 1538431804, issued on 02/02/2012.
Does Peter Nelken, NP, ANP-BC prescribe opioids? ▼
Yes, Peter Nelken, NP, ANP-BC had 23 opioid claims in 2024 with an opioid prescribing rate of 10.6%.
How many Orthopedic Registered Nurse providers are there in the US? ▼
There are 289 Orthopedic Registered Nurse providers across 48 states in the US. The average Orthopedic Registered Nurse provider writes 635 Medicare Part D claims per year.
What drugs does Peter Nelken, NP, ANP-BC prescribe most often? ▼
Based on 2024 Medicare Part D data, Peter Nelken, NP, ANP-BC's most frequently prescribed drugs include Oxycodone Hcl, Sulfamethoxazole-Trimethoprim, Nifedipine Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Peter Nelken, NP, ANP-BC accept Medicare? ▼
Peter Nelken, NP, ANP-BC appears in CMS Medicare data with 218 Part D claims and 67 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Peter Nelken, NP, ANP-BC's credentials? ▼
Peter Nelken, NP, ANP-BC's NPI is 1538431804 with credentials NP, ANP-BC. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.