NPI registry status
Active
2026 NPPES data Addiction Medicine (Family Medicine) Physician NPI 1144214958 MD
Verify on CMS → Ashutosh Diwan, MD
Addiction Medicine (Family Medicine) Physician in Warrenton, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 799 in Addiction Medicine (Family Medicine) 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
7K
Medicare Part D claims · 369 beneficiaries · Addiction Medicine (Family Medicine) Physician avg: 1K
Generic prescribing
86%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$596.31
36 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Ashutosh Diwan, MD filed 7,163 Medicare Part D claims in 2024 as an Addiction Medicine (Family Medicine) Physician in Warrenton, Virginia, prescribing 86% generic.
- 7K
- Part D claims, 2024
- 86%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥96th
- 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 Ashutosh Diwan, MD
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 1144214958), first enumerated 09/07/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 7,163 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
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$596.31 in reported industry payments (36 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 Diwan with other Addiction Medicine (Family Medicine) Physician providers
Same primary specialty, same federal CMS NPPES roster.
Also enrolled in Virginia
- Kimberly Albero, DNP FNP-BC Charlottesville, VA
- Dr. William Alford, MD Virginia Beach, VA
- Chastity Campbell, MSN, APRN, FNP-C Richmond, VA
- Dr. Maria Encarnacion, M.D. Willis, VA
- Dr. Su Fairchild, MD Winchester, VA
- Dr. James Gardner, MD Richmond, VA
Other specialties in Warrenton: Pharmacist (47) · Physical Therapist (38) · Clinical Social Worker (30) · Family Nurse Practitioner (26)
CMS NPPES provider registry desk
NPI 1144214958 · Addiction Medicine (Family Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1144214958
- ENUM-LEGACY 2005
- TAX-NARROW 799
- RX-MID 7,163
- BOOK-THIN 20 in Virginia
- PHOTO-ENUM Humberto Vergara, M.D. · 2005
Ashutosh Diwan, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
7,163 ≥ 96th percentile 96% 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)
Ashutosh Diwan, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Ashutosh Diwan, MD?
Quality data not reportedPrimary specialty
Addiction Medicine (Family Medicine) Physician
Medicare Part D claims
7,163 6× vs specialty avg
Specialty distribution in Virginia
How Addiction Medicine (Family Medicine) Physician compares to other specialties among Virginia 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 Addiction Medicine (Family Medicine) 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 | 1144214958 |
|---|---|
| Specialty | Addiction Medicine (Family Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/07/2005 |
Hospital and facility affiliations
Facilities where Ashutosh Diwan, MD 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.
Mid America Pain Clinic LLC
Overland Park, KS
Uva Community Health Medical Group LLC
Warrenton, VA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Ashutosh Diwan, MD. Source: openpaymentsdata.cms.gov.
Total received
$596
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Ashutosh Diwan, MD - brand share 14.0%
Addiction Medicine (Family Medicine) Physician average
14% brand-name claims vs 86% generic, on 7,163 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.
7,163
Total Claims
$813K
Total Drug Cost
369
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 11,466.533
- Total Day Supply
- 317,609
- Brand vs Generic
- 14% brand / 86% generic
- Brand Drug Cost
- $569K
- Generic Drug Cost
- $242K
- Opioid Claims
- 1,800 (25.1% rate)
- Antibiotic Claims
- 174
Patient Demographics
- Average Patient Age
- 68.2 years
- Avg HCC Risk Score
- 1.41
- Gender Split
- 53% female / 47% male
- Age Distribution
- <65: 106, 65-74: 178, 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 Ashutosh Diwan, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
468 claims
- Oxycodone Hcl
Oxycodone Hcl
388 claims
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
305 claims
- Gabapentin
Gabapentin
258 claims
- Levothyroxine Sodium
Levothyroxine Sodium
198 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
194 claims
- Atorvastatin Calcium 181
Atorvastatin Calcium
181 claims
- Tizanidine Hcl 179
Tizanidine Hcl
179 claims
| Drug | Claims |
|---|---|
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 468 |
| Oxycodone Hcl | 388 |
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 305 |
| Gabapentin | 258 |
| Levothyroxine Sodium | 198 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 194 |
| Atorvastatin Calcium | 181 |
| Tizanidine Hcl | 179 |
| Morphine Sulfate Er Morphine Sulfate | 168 |
| Pregabalin | 125 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Addiction Medicine (Family Medicine) Physician in VA →
All providers in Virginia →
Compare specialties →
Addiction Medicine (Family Medicine) Physician Overview
How Ashutosh Diwan, MD fits within the Addiction Medicine (Family Medicine) Physician landscape nationally.
799
Addiction Medicine (Family Medicine) Physician Providers in US
49
States with Addiction Medicine (Family Medicine) Physician
1,187
Avg Claims per Provider
Ashutosh Diwan, MD's 7,163 claims are above the specialty average of 1,187.
Nationwide Addiction Medicine (Family Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Diwan, both outside Virginia 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 Addiction Medicine (Family Medicine) Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Diwan.
One of 20 Addiction Medicine (Family Medicine) Physician providers enrolled in Virginia, 11 are shown on this page.
Dr. Margaret Gregorczyk
MD
Raven, VA
Dr. Heidi Kulberg
M.D., M.P.H.
Virginia Beach, VA
Dr. Carlos Llanes
MD
Richmond, VA
Dr. Dana Lowenthal
D.O.
Danville, VA
Tanya Lyte
FNP-BC
Manassas, VA
Compare Addiction Medicine (Family Medicine) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ashutosh Diwan, MD's specialty? ▼
Ashutosh Diwan, MD specializes in Addiction Medicine (Family Medicine) Physician and practices in Warrenton, Virginia. Credentials: MD.
How much does Ashutosh Diwan, MD prescribe under Medicare Part D? ▼
In 2024, Ashutosh Diwan, MD wrote 7,163 Medicare Part D claims totaling $813K in drug costs for 369 beneficiaries.
Where is Ashutosh Diwan, MD located? ▼
Ashutosh Diwan, MD is located at 493 BLACKWELL RD, Warrenton, VA, 20186. Phone: (540) 347-4400.
What is Ashutosh Diwan, MD's NPI number? ▼
Ashutosh Diwan, MD's National Provider Identifier (NPI) is 1144214958, issued on 09/07/2005.
Does Ashutosh Diwan, MD prescribe more brand-name or generic drugs? ▼
Ashutosh Diwan, MD's prescribing is 14% brand-name and 86% generic drugs by claim count, with $569K in brand drug costs.
Does Ashutosh Diwan, MD prescribe opioids? ▼
Yes, Ashutosh Diwan, MD had 1,800 opioid claims in 2024 with an opioid prescribing rate of 25.1%.
How many Addiction Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 799 Addiction Medicine (Family Medicine) Physician providers across 49 states in the US. The average Addiction Medicine (Family Medicine) Physician provider writes 1,187 Medicare Part D claims per year.
What drugs does Ashutosh Diwan, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Ashutosh Diwan, MD's most frequently prescribed drugs include Oxycodone-Acetaminophen, Oxycodone Hcl, Buprenorphine-Naloxone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ashutosh Diwan, MD accept Medicare? ▼
Ashutosh Diwan, MD appears in CMS Medicare data with 7,163 Part D claims and 369 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ashutosh Diwan, MD's credentials? ▼
Ashutosh Diwan, MD's NPI is 1144214958 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.
- 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.