NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1871607820 MD
Verify on CMS → Mark Prange, MD
Geriatric Medicine (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 4,171 in Geriatric Medicine (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
5K
Medicare Part D claims · 86 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
82%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Prange, MD filed 4,542 Medicare Part D claims in 2023 as a Geriatric Medicine (Internal Medicine) Physician in San Antonio, Texas, prescribing 82% generic.
- 5K
- Part D claims, 2023
- 82%
- generic prescribing
- 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.
Mark Prange, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,542 Top 7% higher than 93% 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)
Mark Prange, 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 Mark Prange, MD?
Quality data not reportedPrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
4,542 2% vs specialty avg
Specialty distribution in Texas
How Geriatric Medicine (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 Geriatric Medicine (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).
Mark Prange, MD appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding MD credentials at 5007 E BEVERLY MAE DR, San Antonio, TX, 78229, with a listed phone of (210) 417-3341. NPI 1871607820 was issued on 08/18/2006.
Medicare Part D records for calendar year 2023 show 4,542 prescription claims written by this provider, covering 86 Medicare beneficiaries and totaling roughly $255K in drug spend, split 16% brand-name and 82% generic by claim count, with an opioid prescribing rate of 3.0%.
Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,171 enrolled providers across 52 states and an average of 4,450 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 | 1871607820 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/18/2006 |
Hospital and facility affiliations
Facilities where Mark Prange, 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.
CH Specialty Services TX PLLC
Austin, TX
Curana Health Medical Group LLC
Austin, 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 Mark Prange, MD. To verify Mark Prange, MD'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 · Typical
Mark Prange, MD - brand share 16.0%
Geriatric Medicine (Internal Medicine) Physician average
16% brand-name claims vs 82% generic, on 4,542 2023 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 2023.
4,542
Total Claims
$255K
Total Drug Cost
86
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,625
- Total Day Supply
- 119,092
- Brand vs Generic
- 16% brand / 82% generic
- Brand Drug Cost
- $168K
- Generic Drug Cost
- $85K
- Opioid Claims
- 134 (3.0% rate)
- Antibiotic Claims
- 165
Patient Demographics
- Average Patient Age
- 89.6 years
- Avg HCC Risk Score
- 1.40
- Gender Split
- 85% female / 15% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Prange, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
291 claims
- Potassium Chloride
Potassium Chloride
193 claims
- Lactulose
Lactulose
160 claims
- Furosemide
Furosemide
156 claims
- Escitalopram Oxalate
Escitalopram Oxalate
146 claims
- Lisinopril 110
Lisinopril
110 claims
- Carvedilol 108
Carvedilol
108 claims
- Donepezil Hcl 106
Donepezil Hcl
106 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 291 |
| Potassium Chloride | 193 |
| Lactulose | 160 |
| Furosemide | 156 |
| Escitalopram Oxalate | 146 |
| Lisinopril | 110 |
| Carvedilol | 108 |
| Donepezil Hcl | 106 |
| Januvia Sitagliptin Phosphate | 102 |
| Memantine Hcl | 99 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Internal Medicine) Physician in TX →
All providers in Texas →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How Mark Prange, MD fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.
4,171
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider
Mark Prange, MD's 4,542 claims are above the specialty average of 4,450.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Prange.
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 Geriatric Medicine (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.
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Frequently Asked Questions
What is Mark Prange, MD's specialty? ▼
Mark Prange, MD specializes in Geriatric Medicine (Internal Medicine) Physician and practices in San Antonio, Texas. Credentials: MD.
How much does Mark Prange, MD prescribe under Medicare Part D? ▼
In 2023, Mark Prange, MD wrote 4,542 Medicare Part D claims totaling $255K in drug costs for 86 beneficiaries.
Where is Mark Prange, MD located? ▼
Mark Prange, MD is located at 5007 E BEVERLY MAE DR, San Antonio, TX, 78229. Phone: (210) 417-3341.
What is Mark Prange, MD's NPI number? ▼
Mark Prange, MD's National Provider Identifier (NPI) is 1871607820, issued on 08/18/2006.
Does Mark Prange, MD prescribe more brand-name or generic drugs? ▼
Mark Prange, MD's prescribing is 16% brand-name and 82% generic drugs by claim count, with $168K in brand drug costs.
Does Mark Prange, MD prescribe opioids? ▼
Yes, Mark Prange, MD had 134 opioid claims in 2023 with an opioid prescribing rate of 3.0%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,171 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does Mark Prange, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Prange, MD's most frequently prescribed drugs include Levothyroxine Sodium, Potassium Chloride, Lactulose. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Prange, MD accept Medicare? ▼
Mark Prange, MD appears in CMS Medicare data with 4,542 Part D claims and 86 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Prange, MD's credentials? ▼
Mark Prange, MD's NPI is 1871607820 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 (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.
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.