Gregory Gruener, MD
NPI 1689640138 · Neurology Physician · Maywood, IL
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Gruener, MD is a Neurology Physician provider in Maywood, IL (NPI 1689640138).
Provider details
- NPI number
- 1689640138
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 36064200 (IL)
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 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
107 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) |
|---|---|---|
| Needle Measurement of Electrical Activity in Arm Or Leg Muscles, Limited Study95885 | 35 | $18 |
| Needle Measurement of Electrical Activity in Arm Or Leg Muscles, Complete Study95886 | 29 | $45 |
| Nerve Conduction, 5-6 Studies95909 | 23 | $79 |
| Nerve Conduction, 7-8 Studies95910 | 20 | $102 |
Typical Medicare-allowed amounts for these services range $18–$102 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-24
- Last updated
- 2021-11-11
- Certified
- 2021-11-11
Frequently asked questions
- What is Gregory Gruener's NPI number?
- Gregory Gruener's National Provider Identifier (NPI) is 1689640138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Gruener's specialty?
- Gregory Gruener is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Gruener located?
- Gregory Gruener's practice location on file with NPPES is 2160 S 1st Ave, Maywood, IL 60153.
- What is Gregory Gruener's phone number?
- The practice phone number listed in the NPPES registry for Gregory Gruener is (708) 216-2662.
- Does Gregory Gruener accept Medicare?
- Gregory Gruener is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Gruener's NPI active?
- Yes — Gregory Gruener's NPI (1689640138) is active in the NPPES registry as of the last update on 2021-11-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.