Sundar Ramanathan, M.D.
NPI 1629105234 · Nephrology Physician · Flint, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sundar Ramanathan, M.D. is a Nephrology Physician provider in Flint, MI (NPI 1629105234).
Provider details
- NPI number
- 1629105234
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301083236 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,138 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 432 | $121 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 225 | $75 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 183 | $278 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 75 | $113 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 64 | $165 |
| Dialysis Services, 1 Physician Visit Per Month (20 Years Or Older)90962 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 60 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Calcitriol | 389 | 138 |
| Allopurinol | 227 | 77 |
| Potassium Chloride | 190 | 62 |
| Furosemide | 159 | 75 |
| Nifedipinebrand: Nifedipine Er | 132 | 32 |
| Amlodipine Besylate | 131 | 51 |
| Sevelamer Carbonate | 105 | 33 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-28
- Last updated
- 2008-07-02
Frequently asked questions
- What is Sundar Ramanathan's NPI number?
- Sundar Ramanathan's National Provider Identifier (NPI) is 1629105234, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sundar Ramanathan's specialty?
- Sundar Ramanathan is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Sundar Ramanathan located?
- Sundar Ramanathan's practice location on file with NPPES is 5080 Villa Linde Pkwy, Flint, MI 48532-3423.
- What is Sundar Ramanathan's phone number?
- The practice phone number listed in the NPPES registry for Sundar Ramanathan is (810) 720-0162.
- Does Sundar Ramanathan accept Medicare?
- Sundar Ramanathan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sundar Ramanathan's NPI active?
- Yes — Sundar Ramanathan's NPI (1629105234) is active in the NPPES registry as of the last update on 2008-07-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.