Gregory Mlacker, M.D.
NPI 1205219904 · Diagnostic Radiology Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Mlacker, M.D. is a Diagnostic Radiology Physician provider in Grand Rapids, MI (NPI 1205219904).
Provider details
- NPI number
- 1205219904
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A166901 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
3,173 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 671 | $8 |
| Low Dose Ct Scan of Chest for Lung Cancer Screening71271 | 251 | $51 |
| Ct Scan Head Or Brain Without Contrast70450 | 244 | $39 |
| Mri Scan of Pelvis Before and After Contrast72197 | 201 | $103 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 200 | $85 |
| Ct Scan of Chest Without Contrast71250 | 134 | $51 |
| Mri Scan of Abdomen Before and After Contrast |
Practice location
Mailing address
Additional practice locations (2)
- 505 Parnassus AveSan Francisco, CA 94143-2204Phone: (415) 353-1821
- 44405 Woodward AvePontiac, MI 48341-5023Phone: (248) 858-6233
Registry dates
- Enumerated
- 2015-06-30
- Last updated
- 2021-07-15
- Certified
- 2021-07-15
Frequently asked questions
- What is Gregory Mlacker's NPI number?
- Gregory Mlacker's National Provider Identifier (NPI) is 1205219904, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Mlacker's specialty?
- Gregory Mlacker is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Mlacker located?
- Gregory Mlacker's practice location on file with NPPES is 3264 N Evergreen Dr Ne, Grand Rapids, MI 49525-9746.
- What is Gregory Mlacker's phone number?
- The practice phone number listed in the NPPES registry for Gregory Mlacker is (616) 363-7272.
- Does Gregory Mlacker accept Medicare?
- Gregory Mlacker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Mlacker's NPI active?
- Yes — Gregory Mlacker's NPI (1205219904) is active in the NPPES registry as of the last update on 2021-07-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.