NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1548460314 M.D.
Verify on CMS → Anthony Hartzler, M.D.
Internal Medicine Physician in San Antonio, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 174,792 in Internal 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
526
Medicare Part D claims · 93 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
58%
generic claims · 42% 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
Anthony Hartzler, M.D. filed 526 Medicare Part D claims in 2024 as an Internal Medicine Physician in San Antonio, Texas, prescribing 58% generic.
- 526
- Part D claims, 2024
- 58%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥65th
- 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 Anthony Hartzler, 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 1548460314), first enumerated 07/20/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 526 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
- State context
State board disciplinary context
Texas statewide board action statistics are published annually — these figures describe aggregate state activity, not Anthony Hartzler, M.D.'s individual license status. Verify directly with the state medical board.
Source: TMB annual report 2023
- 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 1548460314 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1548460314
- ENUM-MID 2007
- TAX-MEGA 175K Internal Medicine
- RX-LIGHT 526
- BOOK-MID 11,069 in Texas
- PHOTO-ENUM Janet Cevallos-Brenn… · 2007
Anthony Hartzler, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
526 ≥ 65th percentile 65% 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)
Anthony Hartzler, 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 Anthony Hartzler, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
526 81% vs specialty avg
Specialty distribution in Texas
How Internal Medicine Physician compares to other specialties among Texas 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 Internal 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 | 1548460314 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/20/2007 |
Hospital and facility affiliations
Facilities where Anthony Hartzler, 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.
University OF Texas Health Science Center AT San Antonio
San Antonio, TX
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Texas TMB 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 ~77K Texas medical licensees in 2023 - they are NOT specific to Anthony Hartzler, M.D.. To verify Anthony Hartzler, M.D.'s current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB 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 Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Anthony Hartzler, M.D. - brand share 42.0%
Internal Medicine Physician average
42% brand-name claims vs 58% generic, on 526 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.
526
Total Claims
$727K
Total Drug Cost
93
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 621.8
- Total Day Supply
- 16,875
- Brand vs Generic
- 42% brand / 58% generic
- Brand Drug Cost
- $702K
- Generic Drug Cost
- $26K
- Antibiotic Claims
- 181
Patient Demographics
- Average Patient Age
- 64.5 years
- Avg HCC Risk Score
- 3.82
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 37, 65-74: 45, 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 Anthony Hartzler, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Biktarvy
Biktarvy
51 claims
- Dovato
Dovato
50 claims
- Fluconazole
Fluconazole
30 claims
- Tivicay
Tivicay
30 claims
- Prezcobix
Prezcobix
26 claims
- Genvoya 17
Genvoya
17 claims
- Isoniazid 16
Isoniazid
16 claims
- Azithromycin 15
Azithromycin
15 claims
| Drug | Claims |
|---|---|
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 51 |
| Dovato Dolutegravir Sodium/Lamivudine | 50 |
| Fluconazole | 30 |
| Tivicay Dolutegravir Sodium | 30 |
| Prezcobix Darunavir/Cobicistat | 26 |
| Genvoya Elviteg/Cob/Emtri/Tenof Alafen | 17 |
| Isoniazid | 16 |
| Azithromycin | 15 |
| Levofloxacin | 15 |
| Methenamine Hippurate | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Anthony Hartzler, M.D. fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Anthony Hartzler, M.D.'s 526 claims are below the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Hartzler, both outside Texas so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Hartzler.
One of 11,069 Internal Medicine Physician providers enrolled in Texas, 5 are shown here.
Dr. Muhammad A. Sattar
MD
Dallas, TX
Dr. Gayatri Aaluri
MD
Galveston, TX
Anunaya Aashish
Denton, TX
Dr. Queenie Ann Abad
M.D.
San Antonio, TX
Dr. Fuad Abaleka
M.D
Lubbock, TX
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Anthony Hartzler, M.D.'s specialty? ▼
Anthony Hartzler, M.D. specializes in Internal Medicine Physician and practices in San Antonio, Texas. Credentials: M.D..
How much does Anthony Hartzler, M.D. prescribe under Medicare Part D? ▼
In 2024, Anthony Hartzler, M.D. wrote 526 Medicare Part D claims totaling $727K in drug costs for 93 beneficiaries.
Where is Anthony Hartzler, M.D. located? ▼
Anthony Hartzler, M.D. is located at 4502 MEDICAL DR, San Antonio, TX, 78229. Phone: (210) 358-4000.
What is Anthony Hartzler, M.D.'s NPI number? ▼
Anthony Hartzler, M.D.'s National Provider Identifier (NPI) is 1548460314, issued on 07/20/2007.
Does Anthony Hartzler, M.D. prescribe more brand-name or generic drugs? ▼
Anthony Hartzler, M.D.'s prescribing is 42% brand-name and 58% generic drugs by claim count, with $702K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Anthony Hartzler, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Anthony Hartzler, M.D.'s most frequently prescribed drugs include Biktarvy, Dovato, Fluconazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Anthony Hartzler, M.D. accept Medicare? ▼
Anthony Hartzler, M.D. appears in CMS Medicare data with 526 Part D claims and 93 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Anthony Hartzler, M.D.'s credentials? ▼
Anthony Hartzler, M.D.'s NPI is 1548460314 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.