NPI registry status
Active
2026 NPPES data Anesthesiology Physician NPI 1013288323 MD
Verify on CMS → William Nelson, MD
Anesthesiology Physician in Poway, 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 57,554 in Anesthesiology Physician, 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.
What the federal data shows
William Nelson, MD is an Anesthesiology Physician in Poway, California, listed in the federal CMS National Provider Identifier registry.
- #31
- Anesthesiology Physician rank among California specialties
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 William Nelson, MD
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1013288323), first enumerated 01/18/2012.
Source: CMS NPPES
- Not in federal data
Medicare Part D participation
No 2023 Medicare Part D prescribing volume appears in the CMS public file for this NPI (may reflect specialty, new enrollment, or non-prescribing role).
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not William Nelson, MD's individual license status. Verify directly with the state medical board.
Source: Medical Board of California annual report FY 2022-23
- 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.
Compare Nelson with other Anesthesiology Physician providers
Same primary specialty, same federal CMS NPPES roster.
Also enrolled in California
- Dr. Alison A'Court, MD San Diego, CA
- Dr. Peter Abaci, MD Los Gatos, CA
- Dr. Elma Abad-Pelsang, MD Del Mar, CA
- Dr. Rolando Abada, M.D. San Diego, CA
- Dr. Maher Abadir, MD Turlock, CA
- Dr. Jerry Abajian, M.D. Napa, CA
Other specialties in Poway: Behavior Technician (506) · Behavior Analyst (93) · General Practice Dentistry (48) · Marriage & Family Therapist (48)
CMS NPPES provider registry desk
NPI 1013288323 · Anesthesiology Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-NONE · BOOK-MID · PHOTO-ENUM
- NPI-10 1013288323
- ENUM-MID 2012
- TAX-MEGA 58K Anesthesiology Physician
- RX-NONE No Part D
- BOOK-MID 7,276 in California
- PHOTO-ENUM Matthew Vogt, M.D. · 2012
◑
Board-eligible specialty (heuristic, not verified)
William Nelson, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about William Nelson, MD?
Quality data not reportedPrimary specialty
Anesthesiology Physician
Specialty distribution in California
How Anesthesiology Physician compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Anesthesiology Physician. Verify directly:
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 | 1013288323 |
|---|---|
| Specialty | Anesthesiology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/18/2012 |
License & disciplinary context - California Medical Board of California, FY 2022-23
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across 148,769 California physician licenses in effect in FY 2022-23 - they are NOT specific to William Nelson, MD. To verify William Nelson, MD's current license status, use the state board's own license search (see California license lookup), or the Federation of State Medical Boards (FSMB) verification service.
374
Administrative board actions, California FY 2022-23
2.51
Actions per 1,000 physician licenses in effect
California statewide rate
Probation
Most common action type
148 actions
Source: Medical Board of California Annual Report 2022-2023, page 18 (licenses in effect: page 12). Full breakdown by action type on the California discipline page.
Anesthesiology Physician Overview
How William Nelson, MD fits within the Anesthesiology Physician landscape nationally.
57,554
Anesthesiology Physician Providers in US
56
States with Anesthesiology Physician
823
Avg Claims per Provider
Nationwide Anesthesiology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nelson, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2012)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Anesthesiology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nelson.
One of 7,276 Anesthesiology Physician providers enrolled in California, 11 are shown on this page.
Carolyn Abbasi
Loma Linda, CA
Dr. Christine Abboud
D.O.
Walnut Creek, CA
Dr. Steven Abboud
MD
Palo Alto, CA
Dr. Therese Abboud
M.D.
Coronado, CA
Alireza Abdollahi-Fard
Fresno, CA
Compare Anesthesiology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Nelson, MD's specialty? ▼
William Nelson, MD specializes in Anesthesiology Physician and practices in Poway, California. Credentials: MD.
Where is William Nelson, MD located? ▼
William Nelson, MD is located at 13439 CALLE COLINA, Poway, CA, 92064. Phone: (858) 385-9064.
What is William Nelson, MD's NPI number? ▼
William Nelson, MD's National Provider Identifier (NPI) is 1013288323, issued on 01/18/2012.
How many Anesthesiology Physician providers are there in the US? ▼
There are 57,554 Anesthesiology Physician providers across 56 states in the US. The average Anesthesiology Physician provider writes 823 Medicare Part D claims per year.
Does William Nelson, MD accept Medicare? ▼
William Nelson, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Nelson, MD's credentials? ▼
William Nelson, MD's NPI is 1013288323 with credentials MD. 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.
- 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 September 2026.