What is Nancy Niemann Royer's specialty?

Nancy Niemann Royer (NPI 1326094145) is a Medicare-billing provider whose primary specialty is Internal Medicine in O Fallon, MO.

Where does Nancy Niemann Royer practice?

Nancy Niemann Royer practices in O Fallon, MO, based on the location reported in the CMS Medicare provider datasets for NPI 1326094145.

How much does Medicare pay Nancy Niemann Royer?

Nancy Niemann Royer (NPI 1326094145) received approximately $10K in total Medicare Part B payments, serving 90 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1326094145

Nancy Niemann RoyerMD

Internal MedicineO Fallon, MOI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

Distinct HCPCS

Medicare payment

$9K

Peer benchmark

Total Medicare services vs. 1,563 Internal Medicine providers in MO — bottom quintile (cohort median 658).

PRESCRIBING · PART D · 2024

No data available for this provider in 2024.

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 Nancy Niemann Royer'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). 14 inbound referrers · 51 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
James Kelly Diagnostic Radiology · Saint Louis, MO	52	124
Neal Holzum Internal Medicine · O Fallon, MO	44	77
Nadia Zia Internal Medicine · O Fallon, MO	38	89
St. Charles County Ambulance District Ambulance Service Provider · Saint Peters, MO	34	117
Christine Wilmsen Internal Medicine · Jennings, MO	28	33
SSM HEALTH CARE ST. LOUIS	28	67
BARNES JEWISH ST PETERS HOSPITAL INC	25	79
MISSOURI BAPTIST MEDICAL CENTER	25	54
ST. LUKES EPISCOPAL-PRESBYTERIAN HOSPITAL	21	69
MERCY HOSPITALS EAST COMMUNITIES	21	49
Joelle Biernacki Diagnostic Radiology · Saint Louis, MO	18	45
Leo Hsu Emergency Medicine · O Fallon, MO	15	44

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
PROGRESS WEST HEALTHCARE CENTER	353	934
St. Charles County Ambulance District Ambulance Service Provider · Saint Peters, MO	116	321
Hui Hua Shu Diagnostic Radiology · Saint Louis, MO	70	134
Ajay Chapa Diagnostic Radiology · Chicago, IL	67	156
Robert Stachecki Diagnostic Radiology · Saint Louis, MO	66	154
Michael Penney Diagnostic Radiology · Fort Worth, TX	56	137
Nadia Zia Internal Medicine · O Fallon, MO	50	92
Joelle Biernacki Diagnostic Radiology · Saint Louis, MO	48	113
Punita Gupta Diagnostic Radiology · Saint Louis, MO	40	84
Heather Garrett Diagnostic Radiology · Saint Louis, MO	39	79
Neal Holzum Internal Medicine · O Fallon, MO	38	88
James Kelly Diagnostic Radiology · Saint Louis, MO	37	66

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