NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1063449221 M.D.
Verify on CMS → Nagraj Narasimhan, M.D.
Nephrology Physician in Twin Falls, Idaho.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,569 in Nephrology 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
942
Medicare Part D claims · 142 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
82%
generic claims · 18% 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
Nagraj Narasimhan, M.D. filed 942 Medicare Part D claims in 2023 as a Nephrology Physician in Twin Falls, Idaho, prescribing 82% generic.
- 942
- Part D claims, 2023
- 82%
- 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.
Nagraj Narasimhan, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
942 Top 25% higher than 75% 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)
Nagraj Narasimhan, 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 Nagraj Narasimhan, M.D.?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
942 35% vs specialty avg
Specialty distribution in Idaho
How Nephrology Physician compares to other specialties among Idaho 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 Nephrology 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).
Nagraj Narasimhan, M.D. appears in the CMS NPPES registry as a Nephrology Physician provider holding M.D. credentials at 350 N HAVEN DR, Twin Falls, ID, 83301, with a listed phone of (208) 904-4780. NPI 1063449221 was issued on 06/26/2006.
Medicare Part D records for calendar year 2023 show 942 prescription claims written by this provider, covering 142 Medicare beneficiaries and totaling roughly $365K in drug spend, split 18% brand-name and 82% generic by claim count.
Nephrology Physician is a mid-sized specialty nationwide, with 10,569 enrolled providers across 55 states and an average of 1,454 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 | 1063449221 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/26/2006 |
Brand vs generic prescribing mix · Typical
Nagraj Narasimhan, M.D. - brand share 18.0%
Nephrology Physician average
18% brand-name claims vs 82% generic, on 942 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.
942
Total Claims
$365K
Total Drug Cost
142
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,844
- Total Day Supply
- 54,629
- Brand vs Generic
- 18% brand / 82% generic
- Brand Drug Cost
- $281K
- Generic Drug Cost
- $83K
Patient Demographics
- Average Patient Age
- 69.0 years
- Avg HCC Risk Score
- 5.25
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 38, 65-74: 55, 75-84: 37, 85+: 12
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nagraj Narasimhan, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Sevelamer Carbonate
Sevelamer Carbonate
90 claims
- Amlodipine Besylate
Amlodipine Besylate
70 claims
- Auryxia
Auryxia
55 claims
- Velphoro
Velphoro
50 claims
- Prednisone
Prednisone
46 claims
- Calcitriol
Calcitriol
37 claims
- Carvedilol 34
Carvedilol
34 claims
- Lisinopril 34
Lisinopril
34 claims
| Drug | Claims |
|---|---|
| Sevelamer Carbonate | 90 |
| Amlodipine Besylate | 70 |
| Auryxia Ferric Citrate | 55 |
| Velphoro Sucroferric Oxyhydroxide | 50 |
| Prednisone | 46 |
| Calcitriol | 37 |
| Carvedilol | 34 |
| Lisinopril | 34 |
| Losartan Potassium | 30 |
| Lanthanum Carbonate | 29 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Nagraj Narasimhan, M.D. fits within the Nephrology Physician landscape nationally.
10,569
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Nagraj Narasimhan, M.D.'s 942 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in Idaho
Other clinicians with the same primary specialty enrolled in Idaho, drawn from the same CMS NPPES roster as Narasimhan.
Dr. Micheal Adcox
M.D.
Boise, ID
Dr. Scott Bieber
D.O.
Coeur D Alene, ID
Dr. Kenneth Cogen
M.D.
Twin Falls, ID
Dr. Casey Cotant
M.D.
Coeur D Alene, ID
Dr. James Crouch
MD
Boise, ID
Compare Nephrology 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 Idaho medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nephrology 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 Nagraj Narasimhan, M.D.'s specialty? ▼
Nagraj Narasimhan, M.D. specializes in Nephrology Physician and practices in Twin Falls, Idaho. Credentials: M.D..
How much does Nagraj Narasimhan, M.D. prescribe under Medicare Part D? ▼
In 2023, Nagraj Narasimhan, M.D. wrote 942 Medicare Part D claims totaling $365K in drug costs for 142 beneficiaries.
Where is Nagraj Narasimhan, M.D. located? ▼
Nagraj Narasimhan, M.D. is located at 350 N HAVEN DR, Twin Falls, ID, 83301. Phone: (208) 904-4780.
What is Nagraj Narasimhan, M.D.'s NPI number? ▼
Nagraj Narasimhan, M.D.'s National Provider Identifier (NPI) is 1063449221, issued on 06/26/2006.
Does Nagraj Narasimhan, M.D. prescribe more brand-name or generic drugs? ▼
Nagraj Narasimhan, M.D.'s prescribing is 18% brand-name and 82% generic drugs by claim count, with $281K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,569 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does Nagraj Narasimhan, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Nagraj Narasimhan, M.D.'s most frequently prescribed drugs include Sevelamer Carbonate, Amlodipine Besylate, Auryxia. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nagraj Narasimhan, M.D. accept Medicare? ▼
Nagraj Narasimhan, M.D. appears in CMS Medicare data with 942 Part D claims and 142 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nagraj Narasimhan, M.D.'s credentials? ▼
Nagraj Narasimhan, M.D.'s NPI is 1063449221 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.
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.