What is Christopher Grennan's specialty?

Christopher Grennan (NPI 1952620270) is a Medicare-billing provider whose primary specialty is Family Practice in Wamego, KS.

Where does Christopher Grennan practice?

Christopher Grennan practices in Wamego, KS, based on the location reported in the CMS Medicare provider datasets for NPI 1952620270.

How much does Medicare pay Christopher Grennan?

Christopher Grennan (NPI 1952620270) received approximately $147K in total Medicare Part B payments, serving 321 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1952620270

Christopher GrennanMD

Family PracticeWamego, KSI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,682

Unique beneficiaries

—

Total services

3,185

Distinct HCPCS

Medicare payment

$139K

Peer benchmark

Total Medicare services vs. 1,015 Family Practice providers in KS — top quintile (cohort median 801).

PRESCRIBING · PART D · 2024

Total Rx claims

4,672

Beneficiaries

—

Total drug cost

$224K

Distinct drugs

Brand share

10.7%

Top prescribed drugs

Levothyroxine Sodium318 claims

Amlodipine Besylate233 claims

Atorvastatin Calcium206 claims

Lisinopril201 claims

Losartan Potassium179 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Christopher Grennan's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 9 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
STORMONT-VAIL HEALTHCARE INC	42	277
Michael Guhr Physician Assistant · Wamego, KS	34	148
Gregory Welle Diagnostic Radiology · Manhattan, KS	30	82
Jody Toerber-Clark Nurse Practitioner · Wamego, KS	25	164
SPILKER, TODD	16	73
NPI 1144214891	14	41
Steven Seals Clinical Cardiac Electrophysiology · Topeka, KS	13	52
Thomas Doyle Cardiology · Topeka, KS	12	146
WU, LAMBERT	11	31

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events