Nithin Karnan, MD
NPI 1639069099 · Internal Medicine Physician · Mason City, IA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nithin Karnan, MD is a Internal Medicine Physician provider in Mason City, IA (NPI 1639069099).
Provider details
- NPI number
- 1639069099
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- R-13421 (IA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2025-07-08
- Last updated
- 2025-07-08
- Certified
- 2025-07-08
Frequently asked questions
- What is Nithin Karnan's NPI number?
- Nithin Karnan's National Provider Identifier (NPI) is 1639069099, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nithin Karnan's specialty?
- Nithin Karnan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nithin Karnan located?
- Nithin Karnan's practice location on file with NPPES is 1010 4th St Sw, Mason City, IA 50401-2856.
- What is Nithin Karnan's phone number?
- The practice phone number listed in the NPPES registry for Nithin Karnan is (641) 428-5700.
- Does Nithin Karnan accept Medicare?
- Nithin Karnan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nithin Karnan's NPI active?
- Yes — Nithin Karnan's NPI (1639069099) is active in the NPPES registry as of the last update on 2025-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.