NPI registry status
Active
2026 NPPES data Physical Medicine & Rehabilitation Physician NPI 1073594636 DO
Verify on CMS → Thomas Nasser, DO
Physical Medicine & Rehabilitation Physician in Lancaster, 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 15,336 in Physical Medicine & Rehabilitation 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
9K
Medicare Part D claims · 759 beneficiaries · Physical Medicine & Rehabilitation Physician avg: 781
Industry payments
$1.4K
39 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Thomas Nasser, DO filed 9,452 Medicare Part D claims in 2023 as a Physical Medicine & Rehabilitation Physician in Lancaster, California.
- 9K
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Thomas Nasser, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
9,452 Top 2% higher than 98% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Thomas Nasser, DO 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 Thomas Nasser, DO?
Quality data not reportedPrimary specialty
Physical Medicine & Rehabilitation Physician
Medicare Part D claims
9,452 12× vs specialty avg
Specialty distribution in California
How Physical Medicine & Rehabilitation 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 Physical Medicine & Rehabilitation 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).
Thomas Nasser, DO appears in the CMS NPPES registry as a Physical Medicine & Rehabilitation Physician provider holding DO credentials at 43847 HEATON AVE, Lancaster, CA, 93534, with a listed phone of (661) 729-3388. NPI 1073594636 was issued on 11/10/2005.
Medicare Part D records for calendar year 2023 show 9,452 prescription claims written by this provider, covering 759 Medicare beneficiaries and totaling roughly $668K in drug spend, with an opioid prescribing rate of 44.8%.
Physical Medicine & Rehabilitation Physician is a mid-sized specialty nationwide, with 15,336 enrolled providers across 54 states and an average of 781 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1073594636 |
|---|---|
| Specialty | Physical Medicine & Rehabilitation Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 11/10/2005 |
Hospital and facility affiliations
Facilities where Thomas Nasser, DO 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.
Avors Medical Group
Lancaster, 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).
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 Thomas Nasser, DO. Source: openpaymentsdata.cms.gov.
Total received
$1.4K
Largest payer
Medtronic, 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.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Thomas Nasser, DO. To verify Thomas Nasser, DO's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
9,452
Total Claims
$668K
Total Drug Cost
759
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 9,795
- Total Day Supply
- 279,645
- Generic Drug Cost
- $480K
- Opioid Claims
- 4,235 (44.8% rate)
- Antibiotic Claims
- 30
Patient Demographics
- Average Patient Age
- 68.2 years
- Avg HCC Risk Score
- 2.29
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 240, 65-74: 298, 75-84: 177, 85+: 44
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Thomas Nasser, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
1,329 claims
- Gabapentin
Gabapentin
1,023 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
859 claims
- Oxycodone Hcl
Oxycodone Hcl
730 claims
- Morphine Sulfate Er 406
Morphine Sulfate Er
406 claims
- Pregabalin 382
Pregabalin
382 claims
- Tizanidine Hcl 355
Tizanidine Hcl
355 claims
- Methocarbamol 325
Methocarbamol
325 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 1,329 |
| Gabapentin | 1,023 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 859 |
| Oxycodone Hcl | 730 |
| Morphine Sulfate Er Morphine Sulfate | 406 |
| Pregabalin | 382 |
| Tizanidine Hcl | 355 |
| Methocarbamol | 325 |
| Diclofenac Sodium | 313 |
| Cyclobenzaprine Hcl | 299 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Physical Medicine & Rehabilitation Physician in CA →
All providers in California →
Compare specialties →
Physical Medicine & Rehabilitation Physician Overview
How Thomas Nasser, DO fits within the Physical Medicine & Rehabilitation Physician landscape nationally.
15,336
Physical Medicine & Rehabilitation Physician Providers in US
54
States with Physical Medicine & Rehabilitation Physician
781
Avg Claims per Provider
Thomas Nasser, DO's 9,452 claims are above the specialty average of 781.
Nearby Physical Medicine & Rehabilitation Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nasser.
Dr. Payandeh Abadee
M.D.
San Pedro, CA
Dr. Sammantha Abbott
DPT
Eureka, CA
Dr. Alexan Abdel-Malek
MD
Sylmar, CA
Dr. Alicia Abels
M.D.
Folsom, CA
Dr. Gary Abrams
M.D.
San Francisco, CA
Compare Physical Medicine & Rehabilitation Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Physical Medicine & Rehabilitation Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Thomas Nasser, DO's specialty? ▼
Thomas Nasser, DO specializes in Physical Medicine & Rehabilitation Physician and practices in Lancaster, California. Credentials: DO.
How much does Thomas Nasser, DO prescribe under Medicare Part D? ▼
In 2023, Thomas Nasser, DO wrote 9,452 Medicare Part D claims totaling $668K in drug costs for 759 beneficiaries.
Where is Thomas Nasser, DO located? ▼
Thomas Nasser, DO is located at 43847 HEATON AVE, Lancaster, CA, 93534. Phone: (661) 729-3388.
What is Thomas Nasser, DO's NPI number? ▼
Thomas Nasser, DO's National Provider Identifier (NPI) is 1073594636, issued on 11/10/2005.
Does Thomas Nasser, DO prescribe opioids? ▼
Yes, Thomas Nasser, DO had 4,235 opioid claims in 2023 with an opioid prescribing rate of 44.8%.
How many Physical Medicine & Rehabilitation Physician providers are there in the US? ▼
There are 15,336 Physical Medicine & Rehabilitation Physician providers across 54 states in the US. The average Physical Medicine & Rehabilitation Physician provider writes 781 Medicare Part D claims per year.
What drugs does Thomas Nasser, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Thomas Nasser, DO's most frequently prescribed drugs include Hydrocodone-Acetaminophen, Gabapentin, Oxycodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Thomas Nasser, DO accept Medicare? ▼
Thomas Nasser, DO appears in CMS Medicare data with 9,452 Part D claims and 759 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Thomas Nasser, DO's credentials? ▼
Thomas Nasser, DO's NPI is 1073594636 with credentials DO. 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 (2023). 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 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.