NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1316388382 MD
Verify on CMS → Siddhartha Kattamanchi, MD
Nephrology Physician in Marshfield, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,534 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
522
Medicare Part D claims · 143 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
84%
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
Siddhartha Kattamanchi, MD filed 522 Medicare Part D claims in 2023 as a Nephrology Physician in Marshfield, Wisconsin, prescribing 84% generic.
- 522
- Part D claims, 2023
- 84%
- 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.
Siddhartha Kattamanchi, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
522 Top 34% higher than 66% 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)
Siddhartha Kattamanchi, 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 Siddhartha Kattamanchi, MD?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
522 64% vs specialty avg
Specialty distribution in Wisconsin
How Nephrology Physician compares to other specialties among Wisconsin 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).
Siddhartha Kattamanchi, MD appears in the CMS NPPES registry as a Nephrology Physician provider holding MD credentials at 1000 N OAK AVE, Marshfield, WI, 54449, with a listed phone of (715) 387-5511. NPI 1316388382 was issued on 07/08/2013.
Medicare Part D records for calendar year 2023 show 522 prescription claims written by this provider, covering 143 Medicare beneficiaries and totaling roughly $177K in drug spend, split 16% brand-name and 84% generic by claim count.
Nephrology Physician is a mid-sized specialty nationwide, with 10,534 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 | 1316388382 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/08/2013 |
Hospital and facility affiliations
Facilities where Siddhartha Kattamanchi, 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.
Flambeau Hospital, Inc.
Park Falls, WI
Mchs Hospitals Inc
Marshfield, WI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Siddhartha Kattamanchi, MD - brand share 16.0%
Nephrology Physician average
16% brand-name claims vs 84% generic, on 522 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.
522
Total Claims
$177K
Total Drug Cost
143
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,021
- Total Day Supply
- 29,691
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $164K
- Generic Drug Cost
- $13K
- Antibiotic Claims
- 14
Patient Demographics
- Average Patient Age
- 72.0 years
- Avg HCC Risk Score
- 2.24
- Gender Split
- 43% female / 57% male
- Age Distribution
- <65: 21, 65-74: 55, 75-84: 55, 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 Siddhartha Kattamanchi, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amlodipine Besylate
Amlodipine Besylate
59 claims
- Losartan Potassium
Losartan Potassium
52 claims
- Furosemide
Furosemide
49 claims
- Calcitriol
Calcitriol
36 claims
- Lisinopril
Lisinopril
24 claims
- Potassium Citrate Er 21
Potassium Citrate Er
21 claims
- Jardiance 19
Jardiance
19 claims
- Metoprolol Tartrate 19
Metoprolol Tartrate
19 claims
| Drug | Claims |
|---|---|
| Amlodipine Besylate | 59 |
| Losartan Potassium | 52 |
| Furosemide | 49 |
| Calcitriol | 36 |
| Lisinopril | 24 |
| Potassium Citrate Er Potassium Citrate | 21 |
| Jardiance Empagliflozin | 19 |
| Metoprolol Tartrate | 19 |
| Spironolactone | 18 |
| Carvedilol | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Siddhartha Kattamanchi, MD fits within the Nephrology Physician landscape nationally.
10,534
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Siddhartha Kattamanchi, MD's 522 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Kattamanchi.
Dr. Uzoamaka Achufusi
MBBS
Fitchburg, WI
Dr. Venkata Adavikolanu
MD
Green Bay, WI
Dr. Omer Afzal
M.D.
Waukesha, WI
Dr. Osaid Ahmad
MD
Neenah, WI
Dr. Edward Ahrens
M.D.
Madison, WI
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 Wisconsin 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 Siddhartha Kattamanchi, MD's specialty? ▼
Siddhartha Kattamanchi, MD specializes in Nephrology Physician and practices in Marshfield, Wisconsin. Credentials: MD.
How much does Siddhartha Kattamanchi, MD prescribe under Medicare Part D? ▼
In 2023, Siddhartha Kattamanchi, MD wrote 522 Medicare Part D claims totaling $177K in drug costs for 143 beneficiaries.
Where is Siddhartha Kattamanchi, MD located? ▼
Siddhartha Kattamanchi, MD is located at 1000 N OAK AVE, Marshfield, WI, 54449. Phone: (715) 387-5511.
What is Siddhartha Kattamanchi, MD's NPI number? ▼
Siddhartha Kattamanchi, MD's National Provider Identifier (NPI) is 1316388382, issued on 07/08/2013.
Does Siddhartha Kattamanchi, MD prescribe more brand-name or generic drugs? ▼
Siddhartha Kattamanchi, MD's prescribing is 16% brand-name and 84% generic drugs by claim count, with $164K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,534 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 Siddhartha Kattamanchi, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Siddhartha Kattamanchi, MD's most frequently prescribed drugs include Amlodipine Besylate, Losartan Potassium, Furosemide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Siddhartha Kattamanchi, MD accept Medicare? ▼
Siddhartha Kattamanchi, MD appears in CMS Medicare data with 522 Part D claims and 143 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Siddhartha Kattamanchi, MD's credentials? ▼
Siddhartha Kattamanchi, MD's NPI is 1316388382 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.