NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1053791517 M.D.
Verify on CMS → Josiah An, M.D.
Hematology & Oncology Physician in Winston Salem, North 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 11,530 in 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.
Prescribing volume
698
Medicare Part D claims · 187 beneficiaries · Hematology & Oncology Physician avg: 885
Generic prescribing
79%
generic claims · 21% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Josiah An, M.D. filed 698 Medicare Part D claims in 2024 as a Hematology & Oncology Physician in Winston Salem, North Carolina, prescribing 79% generic.
- 698
- Part D claims, 2024
- 79%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥68th
- 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 Josiah An, M.D.
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 1053791517), first enumerated 05/31/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 698 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- 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 1053791517 · Hematology & Oncology Physician
NPI-10 · ENUM-MID · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1053791517
- ENUM-MID 2015
- TAX-MID 12K Hematology &
- RX-LIGHT 698
- BOOK-THIN 360 in North Carolina
- PHOTO-ENUM Jian Guan · 2015
Josiah An, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
698 ≥ 68th percentile 68% 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
✓
Board certification likely (heuristic, not verified)
Josiah An, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Josiah An, M.D.?
Quality data not reportedPrimary specialty
Hematology & Oncology Physician
Medicare Part D claims
698 21% vs specialty avg
Specialty distribution in North Carolina
How Hematology & Oncology Physician compares to other specialties among North 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 & 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 | 1053791517 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/31/2015 |
Hospital and facility affiliations
Facilities where Josiah An, M.D. 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.
Southern California Permanente Medical Group
Bellflower, 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).
Brand vs generic prescribing mix · Typical
Josiah An, M.D. - brand share 21.0%
Hematology & Oncology Physician average
21% brand-name claims vs 79% generic, on 698 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
698
Total Claims
$1.7M
Total Drug Cost
187
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,062.467
- Total Day Supply
- 27,048
- Brand vs Generic
- 21% brand / 79% generic
- Brand Drug Cost
- $1.3M
- Generic Drug Cost
- $427K
- Opioid Claims
- 22 (3.2% rate)
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 2.44
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Josiah An, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Prednisone
Prednisone
57 claims
- Anastrozole
Anastrozole
54 claims
- Abiraterone Acetate
Abiraterone Acetate
51 claims
- Ondansetron Hcl
Ondansetron Hcl
48 claims
- Lenalidomide
Lenalidomide
37 claims
- Dexamethasone
Dexamethasone
36 claims
- Hydroxyurea
Hydroxyurea
36 claims
- Ibrance 18
Ibrance
18 claims
| Drug | Claims |
|---|---|
| Prednisone | 57 |
| Anastrozole | 54 |
| Abiraterone Acetate | 51 |
| Ondansetron Hcl | 48 |
| Lenalidomide | 37 |
| Dexamethasone | 36 |
| Hydroxyurea | 36 |
| Ibrance Palbociclib | 18 |
| Tagrisso Osimertinib Mesylate | 18 |
| Eliquis Apixaban | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology & Oncology Physician in NC →
All providers in North Carolina →
Compare specialties →
Hematology & Oncology Physician Overview
How Josiah An, M.D. fits within the Hematology & Oncology Physician landscape nationally.
11,530
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
885
Avg Claims per Provider
Josiah An, M.D.'s 698 claims are below the specialty average of 885.
Nationwide Hematology & Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for An, both outside North Carolina so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Hematology & Oncology Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as An.
One of 360 Hematology & Oncology Physician providers enrolled in North Carolina, 5 are shown here.
Dr. Jorge Abdallah
MD
Greenville, NC
Thomas Aberant
Durham, NC
Haritha Ackula
MBBS
Kinston, NC
Dr. Soheir Adam
MD
Durham, NC
Dr. Matthew Alberti
DO
Monroe, NC
Compare Hematology & Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Josiah An, M.D.'s specialty? ▼
Josiah An, M.D. specializes in Hematology & Oncology Physician and practices in Winston Salem, North Carolina. Credentials: M.D..
How much does Josiah An, M.D. prescribe under Medicare Part D? ▼
In 2024, Josiah An, M.D. wrote 698 Medicare Part D claims totaling $1.7M in drug costs for 187 beneficiaries.
Where is Josiah An, M.D. located? ▼
Josiah An, M.D. is located at 3333 SILAS CREEK PKWY, Winston Salem, NC, 27103. Phone: (336) 277-8800.
What is Josiah An, M.D.'s NPI number? ▼
Josiah An, M.D.'s National Provider Identifier (NPI) is 1053791517, issued on 05/31/2015.
Does Josiah An, M.D. prescribe more brand-name or generic drugs? ▼
Josiah An, M.D.'s prescribing is 21% brand-name and 79% generic drugs by claim count, with $1.3M in brand drug costs.
Does Josiah An, M.D. prescribe opioids? ▼
Yes, Josiah An, M.D. had 22 opioid claims in 2024 with an opioid prescribing rate of 3.2%.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,530 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 885 Medicare Part D claims per year.
What drugs does Josiah An, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Josiah An, M.D.'s most frequently prescribed drugs include Prednisone, Anastrozole, Abiraterone Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Josiah An, M.D. accept Medicare? ▼
Josiah An, M.D. appears in CMS Medicare data with 698 Part D claims and 187 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Josiah An, M.D.'s credentials? ▼
Josiah An, M.D.'s NPI is 1053791517 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.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- 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.