What is Mark Walshauser's specialty?

Mark Walshauser (NPI 1306020664) is a Medicare-billing provider whose primary specialty is Hematology-Oncology in O Fallon, IL.

Where does Mark Walshauser practice?

Mark Walshauser practices in O Fallon, IL, based on the location reported in the CMS Medicare provider datasets for NPI 1306020664.

How much does Medicare pay Mark Walshauser?

Mark Walshauser (NPI 1306020664) received approximately $3.2M in total Medicare Part B payments, serving 524 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1306020664

Mark WalshauserM.D.

Hematology-OncologyO Fallon, ILI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

4,638

Unique beneficiaries

—

Total services

100,535

Distinct HCPCS

Medicare payment

$529K

Peer benchmark

Total Medicare services vs. 444 Hematology-Oncology providers in IL — top quintile (cohort median 1,266).

PRESCRIBING · PART D · 2024

Total Rx claims

1,288

Beneficiaries

—

Total drug cost

$3.4M

Distinct drugs

Brand share

28.3%

Top prescribed drugs

Anastrozole129 claims

Ondansetron Hcl108 claims

Prochlorperazine Maleate94 claims

Prednisone89 claims

Hydrocodone/Acetaminophen67 claims

QUALITY · MIPS · 2024

Final MIPS score

100.0

Quality

7.0

Cost

61.8

Improvement activities

40.0

Promoting interop.

100.0

Payment adjustment

1.05%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$2K

Payment records

By payment type

Food and Beverage$2K

Education$100

Top paying entities

Food and Beverage$2K

Education$100

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (6)

Hospice

Hospital

Hospital

Hospital

Hospital

Hospital

REFERRAL NETWORK

Where Mark Walshauser'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). 31 inbound referrers · 40 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
James Farn Diagnostic Radiology · Springfield, IL	44	182
DUMONTIER, CHARLES	44	196
Daniel Keys Diagnostic Radiology · Springfield, IL	35	112
HOLDENER, GREGORY	32	152
VINCH, CRAIG	27	95
LAL, ROOP	26	116
LEE, ROBERT	26	102
Medstar Ambulance Inc Ambulance Service Provider · Sparta, IL	26	91
Regina Chiu Cardiology · O Fallon, IL	25	138
Pankaj Kaul Internal Medicine · Belleville, IL	23	197
Amanda Monteleone Physician Assistant · Saint Louis, MO	22	65
Wasseem El-Aneed Internal Medicine · Festus, MO	19	157

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
ST ELIZABETHS HOSPITAL OF THE HOSPITAL SISTERS OF THE THIRD ORDER	88	2,241
Stephen Olson Pathology · Saint Louis, MO	31	272
Charles Smittkamp Diagnostic Radiology · Springfield, IL	30	134
HOLDENER, GREGORY	29	123
Naveen Saini Diagnostic Radiology · Belleville, IL	28	84
Daniel Keys Diagnostic Radiology · Springfield, IL	28	65
James Farn Diagnostic Radiology · Springfield, IL	28	70
Mission Care Of Illinois Llc Ambulance Service Provider · Belleville, IL	26	72
Syed Hussain Internal Medicine · Saint Charles, MO	25	226
PROTESTANT MEMORIAL MEDICAL CENTER, INC.	25	192
HOWARD, ALLISON	21	85
SCHROEDER, PAUL	20	43

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