NPI registry status
Active
2026 NPPES data Pediatric Hematology & Oncology Physician NPI 1750370391 MD
Verify on CMS → Diane Williams, MD
Pediatric Hematology & Oncology Physician in Ashland, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 2,666 in Pediatric Hematology & Oncology 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
Diane Williams, MD is a Pediatric Hematology & Oncology Physician in Ashland, Oregon, listed in the federal CMS National Provider Identifier registry.
- #193
- Pediatric Hematology & Oncology Physician rank among Oregon 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 Diane Williams, 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 1750370391), first enumerated 10/17/2005.
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.
- 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 1750370391 · Pediatric Hematology & Oncology Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1750370391
- ENUM-LEGACY 2005
- TAX-NARROW 2,666
- RX-NONE No Part D
- BOOK-THIN 27 in Oregon
- PHOTO-ENUM Mary Pelszynski · 2005
◑
Board-eligible specialty (heuristic, not verified)
Diane Williams, 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 Diane Williams, MD?
Quality data not reportedPrimary specialty
Pediatric Hematology & Oncology Physician
Specialty distribution in Oregon
How Pediatric Hematology & Oncology Physician compares to other specialties among Oregon 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 Pediatric Hematology & Oncology 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 | 1750370391 |
|---|---|
| Specialty | Pediatric Hematology & Oncology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 10/17/2005 |
More Pediatric Hematology & Oncology Physician in OR →
All providers in Oregon →
Compare specialties →
Pediatric Hematology & Oncology Physician Overview
How Diane Williams, MD fits within the Pediatric Hematology & Oncology Physician landscape nationally.
2,666
Pediatric Hematology & Oncology Physician Providers in US
52
States with Pediatric Hematology & Oncology Physician
88
Avg Claims per Provider
Nationwide Pediatric Hematology & Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Williams, both outside Oregon so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Pediatric Hematology & Oncology Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Williams.
One of 27 Pediatric Hematology & Oncology Physician providers enrolled in Oregon, 5 are shown here.
Dr. Werner Bleyer
M.D.
Bend, OR
Dr. Donna Bradshaw
MD
Ashland, OR
Dr. John Carter
M.D., PH.D
Portland, OR
Dr. Faith Galderisi
DO
Portland, OR
Dr. Kristina Haley
DO
Portland, OR
Compare Pediatric Hematology & Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Diane Williams, MD's specialty? ▼
Diane Williams, MD specializes in Pediatric Hematology & Oncology Physician and practices in Ashland, Oregon. Credentials: MD.
Where is Diane Williams, MD located? ▼
Diane Williams, MD is located at 99 CENTRAL AVE, Ashland, OR, 97520. Phone: (541) 482-9741.
What is Diane Williams, MD's NPI number? ▼
Diane Williams, MD's National Provider Identifier (NPI) is 1750370391, issued on 10/17/2005.
How many Pediatric Hematology & Oncology Physician providers are there in the US? ▼
There are 2,666 Pediatric Hematology & Oncology Physician providers across 52 states in the US. The average Pediatric Hematology & Oncology Physician provider writes 88 Medicare Part D claims per year.
Does Diane Williams, MD accept Medicare? ▼
Diane Williams, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Diane Williams, MD's credentials? ▼
Diane Williams, MD's NPI is 1750370391 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 August 2026.