Gretchen Karstens, MD
NPI 1669405189 · Pediatrics Physician · Duluth, MN
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretchen Karstens, MD is a Pediatrics Physician provider in Duluth, MN (NPI 1669405189).
Provider details
- NPI number
- 1669405189
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 49164 (MN)
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
19 yrs in NPPES 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
- 2006-07-08
- Last updated
- 2020-12-04
- Certified
- 2020-12-04
Frequently asked questions
- What is Gretchen Karstens's NPI number?
- Gretchen Karstens's National Provider Identifier (NPI) is 1669405189, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretchen Karstens's specialty?
- Gretchen Karstens is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Gretchen Karstens located?
- Gretchen Karstens's practice location on file with NPPES is 1012 E 2nd St, Duluth, MN 55805-2200.
- What is Gretchen Karstens's phone number?
- The practice phone number listed in the NPPES registry for Gretchen Karstens is (218) 249-7870.
- Does Gretchen Karstens accept Medicare?
- Gretchen Karstens is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretchen Karstens's NPI active?
- Yes — Gretchen Karstens's NPI (1669405189) is active in the NPPES registry as of the last update on 2020-12-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.