Gretchen Koller, DO
NPI 1821771536 · Neurological Surgery Physician · Southfield, MI
Enrolled with Medicare as Order and Referring Only - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretchen Koller, DO is a Neurological Surgery Physician provider in Southfield, MI (NPI 1821771536).
Provider details
- NPI number
- 1821771536
- Entity type
- Individual
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
2 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-08-09
- Last updated
- 2024-05-23
- Certified
- 2024-05-23
Frequently asked questions
- What is Gretchen Koller's NPI number?
- Gretchen Koller's National Provider Identifier (NPI) is 1821771536, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretchen Koller's specialty?
- Gretchen Koller is listed in the NPPES registry with a primary specialty of Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Gretchen Koller located?
- Gretchen Koller's practice location on file with NPPES is 16001 W 9 Mile Rd, Southfield, MI 48075-4818.
- What is Gretchen Koller's phone number?
- The practice phone number listed in the NPPES registry for Gretchen Koller is (248) 849-3403.
- Does Gretchen Koller accept Medicare?
- Gretchen Koller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretchen Koller's NPI active?
- Yes — Gretchen Koller's NPI (1821771536) is active in the NPPES registry as of the last update on 2024-05-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.