2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1508839937 MD
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RADHA RAMAMRUTHAM, MD

Geriatric Medicine (Internal Medicine) Physician in GLENDALE, Arizona. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
1K
Medicare Part D claims · 116 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
85%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

RADHA RAMAMRUTHAM, MD filed 1,389 Medicare Part D claims in 2023 as a Geriatric Medicine (Internal Medicine) Physician in GLENDALE, Arizona, prescribing 85% generic.

1K
Part D claims, 2023
85%
generic prescribing

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.

RADHA RAMAMRUTHAM, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

1,389 Top 21% higher than 79% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). This entry sits in this band. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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)

RADHA RAMAMRUTHAM, MD 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 RADHA RAMAMRUTHAM, MD?

Quality data not reported

NPI registry status

Active

Issued 02/08/2006

NPI 1508839937

Primary specialty

Geriatric Medicine (Internal Medicine) Physician

Niche

4,161 US NPIs in this specialty

Medicare Part D claims

1,389 69% vs specialty avg

2023 prescription claims

Specialty avg: 4,450

Specialty distribution in Arizona

How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Arizona providers

Arizona providers

Geriatric Medicine (Internal Medicine) Physician share within Arizona

1. Geriatric Medicine (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Geriatric Medicine (Internal Medicine) Physician share within Arizona

Specialty board-certification context

Estimated specialty board-certified rate — Geriatric Medicine (Internal Medicine) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Geriatric Medicine (Internal Medicine) Physician ABMS/AOA estimate

Est. board-certified rate (Geriatric Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Geriatric Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

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).

RADHA RAMAMRUTHAM, MD appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding MD credentials at 20325 N 51ST AVE BLDG 6, GLENDALE, AZ, 85308, with a listed phone of (623) 587-4500. NPI 1508839937 was issued on 02/08/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what RAMAMRUTHAM most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 1,389 prescription claims written by this provider, covering 116 Medicare beneficiaries and totaling roughly $122K in drug spend, split 15% brand-name and 85% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 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

20325 N 51ST AVE BLDG 6
GLENDALE, AZ 85308

Provider Details

NPI 1508839937
Specialty Geriatric Medicine (Internal Medicine) Physician
Credentials MD
Gender Female
NPI Issued 02/08/2006

Brand vs generic prescribing mix · Typical

RADHA RAMAMRUTHAM, MD — brand share 15.0%
Specialty average (est.)

15% brand-name claims vs 85% generic, on 1,389 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.

1,389
Total Claims
$122K
Total Drug Cost
116
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,559
Total Day Supply
42,710
Brand vs Generic
15% brand / 85% generic
Brand Drug Cost
$99K
Generic Drug Cost
$22K

Patient Demographics

Average Patient Age
82.4 years
Avg HCC Risk Score
2.51
Gender Split
57% female / 43% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What RADHA RAMAMRUTHAM, MD prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Quetiapine Fumarate
121
Levothyroxine Sodium
110
Metoprolol Tartrate
65
Escitalopram Oxalate
44
Donepezil Hcl
39
Carvedilol
36
Clopidogrel
Clopidogrel Bisulfate
35
Amlodipine Besylate
32
Tamsulosin Hcl
32
Metformin Hcl
31

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Geriatric Medicine (Internal Medicine) Physician Overview

How RADHA RAMAMRUTHAM, MD fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.

4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider

RADHA RAMAMRUTHAM, MD's 1,389 claims are below the specialty average of 4,450.

Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Arizona

Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as RAMAMRUTHAM.

Compare Geriatric Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is RADHA RAMAMRUTHAM, MD's specialty?
RADHA RAMAMRUTHAM, MD specializes in Geriatric Medicine (Internal Medicine) Physician and practices in GLENDALE, Arizona. Credentials: MD.
How much does RADHA RAMAMRUTHAM, MD prescribe under Medicare Part D?
In 2023, RADHA RAMAMRUTHAM, MD wrote 1,389 Medicare Part D claims totaling $122K in drug costs for 116 beneficiaries.
Where is RADHA RAMAMRUTHAM, MD located?
RADHA RAMAMRUTHAM, MD is located at 20325 N 51ST AVE BLDG 6, GLENDALE, AZ, 85308. Phone: (623) 587-4500.
What is RADHA RAMAMRUTHAM, MD's NPI number?
RADHA RAMAMRUTHAM, MD's National Provider Identifier (NPI) is 1508839937, issued on 02/08/2006.
Does RADHA RAMAMRUTHAM, MD prescribe more brand-name or generic drugs?
RADHA RAMAMRUTHAM, MD's prescribing is 15% brand-name and 85% generic drugs by claim count, with $99K in brand drug costs.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US?
There are 4,161 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 RADHA RAMAMRUTHAM, MD prescribe most often?
Based on 2023 Medicare Part D data, RADHA RAMAMRUTHAM, MD's most frequently prescribed drugs include Quetiapine Fumarate, Levothyroxine Sodium, Metoprolol Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does RADHA RAMAMRUTHAM, MD accept Medicare?
RADHA RAMAMRUTHAM, MD appears in CMS Medicare data with 1,389 Part D claims and 116 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify RADHA RAMAMRUTHAM, MD's credentials?
RADHA RAMAMRUTHAM, MD's NPI is 1508839937 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

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