Gregory Krivonyak, M.D.
NPI 1770772725 · Preventive Medicine/Occupational Environmental Medicine Physician · Chesterfield, MO
Enrolled with Medicare as Practitioner - Preventive Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Krivonyak, M.D. is a Preventive Medicine/Occupational Environmental Medicine Physician provider in Chesterfield, MO (NPI 1770772725).
Provider details
- NPI number
- 1770772725
- Entity type
- Individual
- Primary specialty
- Preventive Medicine/Occupational Environmental Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036163835 (IL)
Specialties & taxonomies
- Preventive Medicine/Occupational Environmental Medicine PhysicianPrimary2083P0500XLicense 2023041829 (MO)
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 258 | 243 |
| Azithromycin | 139 | 133 |
| Amoxicillin | 60 | 58 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 44 | 42 |
| Doxycycline Hyclate | 34 | 34 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 33 | 33 |
| Cefdinir | 33 | 33 |
Practice location
Mailing address
Additional practice locations (1)
- 1431 Opus Pl Ste 110Downers Grove, IL 60515-1164Phone: (954) 399-4673
Registry dates
- Enumerated
- 2007-10-16
- Last updated
- 2025-06-18
- Certified
- 2025-06-18
Frequently asked questions
- What is Gregory Krivonyak's NPI number?
- Gregory Krivonyak's National Provider Identifier (NPI) is 1770772725, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Krivonyak's specialty?
- Gregory Krivonyak is listed in the NPPES registry with a primary specialty of Preventive Medicine/Occupational Environmental Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Krivonyak located?
- Gregory Krivonyak's practice location on file with NPPES is 100 Chesterfield Business Pkwy Fl 2, Chesterfield, MO 63005-1271.
- What is Gregory Krivonyak's phone number?
- The practice phone number listed in the NPPES registry for Gregory Krivonyak is (954) 399-4673.
- Does Gregory Krivonyak accept Medicare?
- Gregory Krivonyak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Krivonyak's NPI active?
- Yes — Gregory Krivonyak's NPI (1770772725) is active in the NPPES registry as of the last update on 2025-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.