NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1790074896 M.D.
Verify on CMS → Cathy Larrain, M.D.
Geriatric Medicine (Internal Medicine) Physician in Baltimore, Maryland.
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
2K
Medicare Part D claims · 162 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
What the federal data shows
Cathy Larrain, M.D. filed 2,006 Medicare Part D claims in 2023 as a Geriatric Medicine (Internal Medicine) Physician in Baltimore, Maryland.
- 2K
- Part D claims, 2023
- ≥84th
- 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.
Cathy Larrain, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,006 ≥ 84th percentile 84% 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-eligible specialty (heuristic, not verified)
Cathy Larrain, 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 Cathy Larrain, M.D.?
Quality data not reportedPrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
2,006 55% vs specialty avg
Specialty distribution in Maryland
How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Maryland 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).
Cathy Larrain, M.D. appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding M.D. credentials at 1040 PARK AVE STE 200, Baltimore, MD, 21201, with a listed phone of (443) 738-0300. NPI 1790074896 was issued on 03/30/2011.
Medicare Part D records for calendar year 2023 show 2,006 prescription claims written by this provider, covering 162 Medicare beneficiaries and totaling roughly $123K in drug spend, with an opioid prescribing rate of 0.7%.
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 | 1790074896 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 03/30/2011 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
2,006
Total Claims
$123K
Total Drug Cost
162
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,492
- Total Day Supply
- 99,430
- Generic Drug Cost
- $46K
- Opioid Claims
- 15 (0.7% rate)
- Antibiotic Claims
- 20
Patient Demographics
- Average Patient Age
- 83.1 years
- Avg HCC Risk Score
- 1.34
- Gender Split
- 75% female / 25% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Cathy Larrain, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Losartan Potassium
Losartan Potassium
118 claims
- Atorvastatin Calcium
Atorvastatin Calcium
104 claims
- Amlodipine Besylate
Amlodipine Besylate
98 claims
- Levothyroxine Sodium
Levothyroxine Sodium
91 claims
- Gabapentin
Gabapentin
75 claims
- Hydralazine Hcl
Hydralazine Hcl
66 claims
- Memantine Hcl
Memantine Hcl
61 claims
- Donepezil Hcl
Donepezil Hcl
54 claims
| Drug | Claims |
|---|---|
| Losartan Potassium | 118 |
| Atorvastatin Calcium | 104 |
| Amlodipine Besylate | 98 |
| Levothyroxine Sodium | 91 |
| Gabapentin | 75 |
| Hydralazine Hcl | 66 |
| Memantine Hcl | 61 |
| Donepezil Hcl | 54 |
| Metoprolol Succinate | 53 |
| Furosemide | 51 |
* 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 MD →
All providers in Maryland →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How Cathy Larrain, M.D. 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
Cathy Larrain, M.D.'s 2,006 claims are below the specialty average of 4,450.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Larrain.
One of 126 Geriatric Medicine (Internal Medicine) Physician providers enrolled in Maryland, 5 are shown here.
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 Maryland 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.
Healthcare Guides
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Medical Specialties Explained
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Frequently Asked Questions
What is Cathy Larrain, M.D.'s specialty? ▼
Cathy Larrain, M.D. specializes in Geriatric Medicine (Internal Medicine) Physician and practices in Baltimore, Maryland. Credentials: M.D..
How much does Cathy Larrain, M.D. prescribe under Medicare Part D? ▼
In 2023, Cathy Larrain, M.D. wrote 2,006 Medicare Part D claims totaling $123K in drug costs for 162 beneficiaries.
Where is Cathy Larrain, M.D. located? ▼
Cathy Larrain, M.D. is located at 1040 PARK AVE STE 200, Baltimore, MD, 21201. Phone: (443) 738-0300.
What is Cathy Larrain, M.D.'s NPI number? ▼
Cathy Larrain, M.D.'s National Provider Identifier (NPI) is 1790074896, issued on 03/30/2011.
Does Cathy Larrain, M.D. prescribe opioids? ▼
Yes, Cathy Larrain, M.D. had 15 opioid claims in 2023 with an opioid prescribing rate of 0.7%.
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 Cathy Larrain, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Cathy Larrain, M.D.'s most frequently prescribed drugs include Losartan Potassium, Atorvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cathy Larrain, M.D. accept Medicare? ▼
Cathy Larrain, M.D. appears in CMS Medicare data with 2,006 Part D claims and 162 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cathy Larrain, M.D.'s credentials? ▼
Cathy Larrain, M.D.'s NPI is 1790074896 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.