NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1821343922 M.D.
Verify on CMS → Mahalakshmi Krishnamoorthy, 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 172,737 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
588
Medicare Part D claims · 226 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
82%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Mahalakshmi Krishnamoorthy, M.D. filed 588 Medicare Part D claims in 2023 as an Internal Medicine Physician in San Antonio, Texas, prescribing 82% generic.
- 588
- Part D claims, 2023
- 82%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥66th
- 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.
Mahalakshmi Krishnamoorthy, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
588 ≥ 66th percentile 66% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Mahalakshmi Krishnamoorthy, M.D. 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 Mahalakshmi Krishnamoorthy, M.D.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
588 78% 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).
Mahalakshmi Krishnamoorthy, M.D. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding M.D. credentials at 4502 MEDICAL DR, San Antonio, TX, 78229, with a listed phone of (210) 358-4000. NPI 1821343922 was issued on 07/16/2012.
Medicare Part D records for calendar year 2023 show 588 prescription claims written by this provider, covering 226 Medicare beneficiaries and totaling roughly $47K in drug spend, split 15% brand-name and 82% generic by claim count, with an opioid prescribing rate of 2.6%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1821343922 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 07/16/2012 |
Hospital and facility affiliations
Facilities where Mahalakshmi Krishnamoorthy, 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
Usacs Integrated Acute Care Services OF Texas, PLLC
Kerrville, 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 Mahalakshmi Krishnamoorthy, M.D.. To verify Mahalakshmi Krishnamoorthy, 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 · Typical
Mahalakshmi Krishnamoorthy, M.D. - brand share 15.0%
Internal Medicine Physician average
15% brand-name claims vs 82% generic, on 588 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.
588
Total Claims
$47K
Total Drug Cost
226
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 635
- Total Day Supply
- 13,635
- Brand vs Generic
- 15% brand / 82% generic
- Brand Drug Cost
- $41K
- Generic Drug Cost
- $6K
- Opioid Claims
- 15 (2.6% rate)
- Antibiotic Claims
- 91
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 2.73
- Gender Split
- 65% female / 35% male
- Age Distribution
- <65: 27, 65-74: 84, 75-84: 71, 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 Mahalakshmi Krishnamoorthy, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
37 claims
- Prednisone
Prednisone
23 claims
- Eliquis
Eliquis
21 claims
- Levofloxacin
Levofloxacin
17 claims
- Amlodipine Besylate
Amlodipine Besylate
16 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
15 claims
- Gabapentin
Gabapentin
15 claims
- Sulfamethoxazole-T…
Sulfamethoxazole-Trimethoprim
15 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 37 |
| Prednisone | 23 |
| Eliquis Apixaban | 21 |
| Levofloxacin | 17 |
| Amlodipine Besylate | 16 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 15 |
| Gabapentin | 15 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 15 |
| Losartan Potassium | 13 |
| Metoprolol Tartrate | 12 |
* 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 Mahalakshmi Krishnamoorthy, M.D. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Mahalakshmi Krishnamoorthy, M.D.'s 588 claims are below the specialty average of 2,716.
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 Krishnamoorthy.
Dr. Muhammad A. Sattar
MD
Dallas, TX
Anunaya Aashish
Denton, TX
Dr. Queenie Ann Abad
M.D.
San Antonio, TX
Dr. Fuad Abaleka
M.D
Lubbock, TX
Dr. Carol Abalihi
M.D.
El Paso, TX
Compare 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 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 Mahalakshmi Krishnamoorthy, M.D.'s specialty? ▼
Mahalakshmi Krishnamoorthy, M.D. specializes in Internal Medicine Physician and practices in San Antonio, Texas. Credentials: M.D..
How much does Mahalakshmi Krishnamoorthy, M.D. prescribe under Medicare Part D? ▼
In 2023, Mahalakshmi Krishnamoorthy, M.D. wrote 588 Medicare Part D claims totaling $47K in drug costs for 226 beneficiaries.
Where is Mahalakshmi Krishnamoorthy, M.D. located? ▼
Mahalakshmi Krishnamoorthy, M.D. is located at 4502 MEDICAL DR, San Antonio, TX, 78229. Phone: (210) 358-4000.
What is Mahalakshmi Krishnamoorthy, M.D.'s NPI number? ▼
Mahalakshmi Krishnamoorthy, M.D.'s National Provider Identifier (NPI) is 1821343922, issued on 07/16/2012.
Does Mahalakshmi Krishnamoorthy, M.D. prescribe more brand-name or generic drugs? ▼
Mahalakshmi Krishnamoorthy, M.D.'s prescribing is 15% brand-name and 82% generic drugs by claim count, with $41K in brand drug costs.
Does Mahalakshmi Krishnamoorthy, M.D. prescribe opioids? ▼
Yes, Mahalakshmi Krishnamoorthy, M.D. had 15 opioid claims in 2023 with an opioid prescribing rate of 2.6%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Mahalakshmi Krishnamoorthy, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mahalakshmi Krishnamoorthy, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Prednisone, Eliquis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mahalakshmi Krishnamoorthy, M.D. accept Medicare? ▼
Mahalakshmi Krishnamoorthy, M.D. appears in CMS Medicare data with 588 Part D claims and 226 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mahalakshmi Krishnamoorthy, M.D.'s credentials? ▼
Mahalakshmi Krishnamoorthy, M.D.'s NPI is 1821343922 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
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.