Christopher Grennan, MD
NPI 1952620270 · Family Medicine Physician · Wamego, KS
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Grennan, MD is a Family Medicine Physician provider in Wamego, KS (NPI 1952620270).
Provider details
- NPI number
- 1952620270
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 04-35075 (KS)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 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
2,984 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 850 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 511 | $118 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 365 | $84 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 226 | $120 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 153 | $58 |
| Blood Test, Clotting Time85610 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 90 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 318 | 69 |
| Amlodipine Besylate | 233 | 61 |
| Atorvastatin Calcium | 206 | 54 |
| Lisinopril | 201 | 56 |
| Losartan Potassium | 179 | 44 |
| Omeprazole | 170 | 49 |
| Pravastatin Sodium | 169 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-26
- Last updated
- 2026-02-12
- Certified
- 2026-02-12
Frequently asked questions
- What is Christopher Grennan's NPI number?
- Christopher Grennan's National Provider Identifier (NPI) is 1952620270, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Grennan's specialty?
- Christopher Grennan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Grennan located?
- Christopher Grennan's practice location on file with NPPES is 1704 Commercial Cir, Wamego, KS 66547-9690.
- What is Christopher Grennan's phone number?
- The practice phone number listed in the NPPES registry for Christopher Grennan is (785) 456-2207.
- Does Christopher Grennan accept Medicare?
- Christopher Grennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Grennan's NPI active?
- Yes — Christopher Grennan's NPI (1952620270) is active in the NPPES registry as of the last update on 2026-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.