NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1114942414 M.D.
Verify on CMS → Joseph Holahan, M.D.
Hematology (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 1,436 in Hematology (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
251
Medicare Part D claims · 52 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Industry payments
$49.35
3 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Joseph Holahan, M.D. filed 251 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in San Antonio, Texas.
- 251
- Part D claims, 2023
- $49.35
- industry payments (Sunshine Act)
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.
Joseph Holahan, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
251 49th percentile higher than 49% 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-eligible specialty (heuristic, not verified)
Joseph Holahan, 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 Joseph Holahan, M.D.?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
251 64% vs specialty avg
Specialty distribution in Texas
How Hematology (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 Hematology (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).
Joseph Holahan, M.D. appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding M.D. credentials at 4383 MEDICAL DR, San Antonio, TX, 78229, with a listed phone of (210) 593-5700. NPI 1114942414 was issued on 07/13/2006.
Medicare Part D records for calendar year 2023 show 251 prescription claims written by this provider, covering 52 Medicare beneficiaries and totaling roughly $858K in drug spend.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 enrolled providers across 50 states and an average of 693 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 | 1114942414 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/13/2006 |
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 Joseph Holahan, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$49
Largest payer
Astellas Pharma US 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 - 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 Joseph Holahan, M.D.. To verify Joseph Holahan, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
251
Total Claims
$858K
Total Drug Cost
52
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 354
- Total Day Supply
- 9,983
- Generic Drug Cost
- $53K
Patient Demographics
- Average Patient Age
- 75.1 years
- Avg HCC Risk Score
- 2.59
- Gender Split
- 42% female / 58% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Joseph Holahan, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Xarelto
Xarelto
39 claims
- Dexamethasone
Dexamethasone
21 claims
- Prednisone
Prednisone
19 claims
- Hydroxyurea
Hydroxyurea
17 claims
- Calquence 13
Calquence
13 claims
- Duloxetine Hcl 11
Duloxetine Hcl
11 claims
- Pegasys 11
Pegasys
11 claims
| Drug | Claims |
|---|---|
| Xarelto Rivaroxaban | 39 |
| Dexamethasone | 21 |
| Prednisone | 19 |
| Hydroxyurea | 17 |
| Calquence Acalabrutinib Maleate | 13 |
| Duloxetine Hcl | 11 |
| Pegasys Peginterferon Alfa-2a | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in TX →
All providers in Texas →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Joseph Holahan, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Joseph Holahan, M.D.'s 251 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Holahan.
Dr. Mohammad Abdulla
MD
Houston, TX
Dr. Aimaz Afrough
M.D.
Dallas, TX
Dr. Yosra Aljawai
M.D.
Houston, TX
Dr. Nitya Alluri
MD
Austin, TX
Dr. Effrosyni Apostolidou
MD, PHD
Houston, TX
Compare Hematology (Internal Medicine) 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 Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology (Internal Medicine) 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Texas
Frequently Asked Questions
What is Joseph Holahan, M.D.'s specialty? ▼
Joseph Holahan, M.D. specializes in Hematology (Internal Medicine) Physician and practices in San Antonio, Texas. Credentials: M.D..
How much does Joseph Holahan, M.D. prescribe under Medicare Part D? ▼
In 2023, Joseph Holahan, M.D. wrote 251 Medicare Part D claims totaling $858K in drug costs for 52 beneficiaries.
Where is Joseph Holahan, M.D. located? ▼
Joseph Holahan, M.D. is located at 4383 MEDICAL DR, San Antonio, TX, 78229. Phone: (210) 593-5700.
What is Joseph Holahan, M.D.'s NPI number? ▼
Joseph Holahan, M.D.'s National Provider Identifier (NPI) is 1114942414, issued on 07/13/2006.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Joseph Holahan, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Joseph Holahan, M.D.'s most frequently prescribed drugs include Xarelto, Dexamethasone, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Joseph Holahan, M.D. accept Medicare? ▼
Joseph Holahan, M.D. appears in CMS Medicare data with 251 Part D claims and 52 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Joseph Holahan, M.D.'s credentials? ▼
Joseph Holahan, M.D.'s NPI is 1114942414 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 (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
Compiled from official public sources by the PlainDoctor editorial team.