Quick answers
- Does Gretchen K. Keene accept Medicare assignment?
- Yes. Medicare's clinician data says Gretchen K. Keene accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gretchen K. Keene see?
- In 2024, CMS data shows 48 Original Medicare patients and 424 services for Gretchen K. Keene. This counts Original Medicare only and measures volume, not quality.
- What is Gretchen K. Keene's NPI number?
- 1346746831. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gretchen K. Keene, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 48 |
|---|---|
| Services billed to Medicare | 424 |
| Different services or procedures | 2 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Chiropractic manipulative treatment, 3-4 spinal regions (98941)418 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol58%
- High blood pressure54%
- Arthritis48%
- Ischemic heart disease25%
Practice locations
Addresses where Gretchen K. Keene is enrolled with Medicare (CMS data updated October 2, 2026).
- 2130 2nd StWhite Bear Lake, MN 55110 (651) 762‑8040
Group practices
Medicare enrollment lists Gretchen K. Keene as a member of this group (CMS data updated October 2, 2026).
- Carlson Chiropractic Corporation5 clinicians in the group
Specialties
- Chiropracticprimary
Other chiropractors in White Bear Lake
Clinicians with the same Medicare primary specialty in White Bear Lake, MN — not a recommendation.
Other clinicians in Carlson Chiropractic Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CH |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346746831 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians