Karin Rettig, MD
NPI 1366402679 · Gastroenterology Physician · Saint Paul, MN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karin Rettig, MD is a Gastroenterology Physician provider in Saint Paul, MN (NPI 1366402679).
Provider details
- NPI number
- 1366402679
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 41057 (MN)
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
20 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
172 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 58 | $36 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 30 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 20 | $124 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 19 | $62 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 18 | $128 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 14 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Omeprazole | 26 |
| Adalimumabbrand: Humira(cf) Pen | 22 |
| Ustekinumabbrand: Stelara | 19 |
| Colestipol Hcl | 17 |
| Balsalazide Disodium | 15 |
| Mercaptopurine | 14 |
| Azathioprine | 12 |
| Budesonidebrand: Budesonide Ec | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-23
- Last updated
- 2008-03-24
Frequently asked questions
- What is Karin Rettig's NPI number?
- Karin Rettig's National Provider Identifier (NPI) is 1366402679, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karin Rettig's specialty?
- Karin Rettig is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Karin Rettig located?
- Karin Rettig's practice location on file with NPPES is 2550 University Ave W, Saint Paul, MN 55114-1052.
- What is Karin Rettig's phone number?
- The practice phone number listed in the NPPES registry for Karin Rettig is (612) 870-5557.
- Does Karin Rettig accept Medicare?
- Karin Rettig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karin Rettig's NPI active?
- Yes — Karin Rettig's NPI (1366402679) is active in the NPPES registry as of the last update on 2008-03-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.