John Karstens
NPI 1457938169 · Sleep Medicine (Internal Medicine) Physician · Erie, PA
Enrolled with Medicare as Practitioner - Sleep Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Karstens is a Sleep Medicine (Internal Medicine) Physician provider in Erie, PA (NPI 1457938169).
Provider details
- NPI number
- 1457938169
- Entity type
- Individual
- Primary specialty
- Sleep Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- OS023662 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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
- 2021-03-27
- Last updated
- 2025-08-22
- Certified
- 2025-08-22
Frequently asked questions
- What is John Karstens's NPI number?
- John Karstens's National Provider Identifier (NPI) is 1457938169, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Karstens's specialty?
- John Karstens is listed in the NPPES registry with a primary specialty of Sleep Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is John Karstens located?
- John Karstens's practice location on file with NPPES is 204 W 26th St, Erie, PA 16508-1806.
- What is John Karstens's phone number?
- The practice phone number listed in the NPPES registry for John Karstens is (814) 868-7581.
- Does John Karstens accept Medicare?
- John Karstens is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Karstens's NPI active?
- Yes — John Karstens's NPI (1457938169) is active in the NPPES registry as of the last update on 2025-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.