NPI registry status
Active
2026 NPPES data Hematology (Pathology) Physician NPI 1508828252 M.D,
Verify on CMS → William Armstrong, M.D,
Hematology (Pathology) Physician in West Columbia, South Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 747 in Hematology (Pathology) 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 Armstrong, M.D, is a Hematology (Pathology) Physician in West Columbia, South Carolina, listed in the federal CMS National Provider Identifier registry.
- #232
- Hematology (Pathology) Physician rank among South Carolina 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.
CMS NPPES provider registry desk
NPI 1508828252 · Hematology (Pathology) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1508828252
- ENUM-LEGACY 2006
- TAX-NARROW 747
- RX-NONE No Part D
- BOOK-THIN 14 in South Carolina
- PHOTO-ENUM Raul Braylan · 2006
◑
Board-eligible specialty (heuristic, not verified)
William Armstrong, M.D, 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 Armstrong, M.D,?
Quality data not reportedPrimary specialty
Hematology (Pathology) Physician
Specialty distribution in South Carolina
How Hematology (Pathology) Physician compares to other specialties among South Carolina 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 Hematology (Pathology) 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 | 1508828252 |
|---|---|
| Specialty | Hematology (Pathology) Physician |
| Credentials | M.D, |
| Gender | Male |
| NPI Issued | 04/06/2006 |
More Hematology (Pathology) Physician in SC →
All providers in South Carolina →
Compare specialties →
Hematology (Pathology) Physician Overview
How William Armstrong, M.D, fits within the Hematology (Pathology) Physician landscape nationally.
747
Hematology (Pathology) Physician Providers in US
46
States with Hematology (Pathology) Physician
617
Avg Claims per Provider
Nationwide Hematology (Pathology) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Armstrong, both outside South Carolina so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Hematology (Pathology) Physician Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Armstrong.
One of 14 Hematology (Pathology) Physician providers enrolled in South Carolina, 5 are shown here.
Dr. Lydia Christiansen
MD
Charleston, SC
Dr. Lorna Cruz
MD
Greenville, SC
Dr. Keni Gu
M.D.
Greenville, SC
Dr. Michael Hayes
MD
Columbia, SC
Dr. Alison Huppmann
M.D.
Greenville, SC
Compare Hematology (Pathology) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is William Armstrong, M.D,'s specialty? ▼
William Armstrong, M.D, specializes in Hematology (Pathology) Physician and practices in West Columbia, South Carolina. Credentials: M.D,.
Where is William Armstrong, M.D, located? ▼
William Armstrong, M.D, is located at 2720 SUNSET BLVD, West Columbia, SC, 29169. Phone: (803) 791-2410.
What is William Armstrong, M.D,'s NPI number? ▼
William Armstrong, M.D,'s National Provider Identifier (NPI) is 1508828252, issued on 04/06/2006.
How many Hematology (Pathology) Physician providers are there in the US? ▼
There are 747 Hematology (Pathology) Physician providers across 46 states in the US. The average Hematology (Pathology) Physician provider writes 617 Medicare Part D claims per year.
Does William Armstrong, M.D, accept Medicare? ▼
William Armstrong, M.D, appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Armstrong, M.D,'s credentials? ▼
William Armstrong, M.D,'s NPI is 1508828252 with credentials M.D,. 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 April 2026 (NPPES) / 2023 (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 May 2026.