What is Aaron Greenspan's specialty?

Aaron Greenspan (NPI 1558382911) is a Medicare-billing provider whose primary specialty is Gastroenterology in Saint Louis, MO.

Where does Aaron Greenspan practice?

Aaron Greenspan practices in Saint Louis, MO, based on the location reported in the CMS Medicare provider datasets for NPI 1558382911.

How much does Medicare pay Aaron Greenspan?

Aaron Greenspan (NPI 1558382911) received approximately $33K in total Medicare Part B payments, serving 211 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1558382911

Aaron GreenspanMD

GastroenterologySaint Louis, MOI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

241

Unique beneficiaries

—

Total services

254

Distinct HCPCS

Medicare payment

$22K

Peer benchmark

Total Medicare services vs. 294 Gastroenterology providers in MO — below median (cohort median 585).

PRESCRIBING · PART D · 2024

Total Rx claims

1,066

Beneficiaries

—

Total drug cost

$756K

Distinct drugs

Brand share

29.5%

Top prescribed drugs

Omeprazole244 claims

Pantoprazole Sodium155 claims

Famotidine101 claims

Peg3350/Sod Sulf,bicarb,cl/Kcl80 claims

Linaclotide69 claims

QUALITY · MIPS · 2024

Final MIPS score

91.0

Quality

72.1

Cost

0.0

Improvement activities

40.0

Promoting interop.

100.0

Payment adjustment

0.68%

APM Entity

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$619

Payment records

By payment type

Food and Beverage$619

Top paying entities

Food and Beverage$619

REFERRAL NETWORK

Where Aaron Greenspan'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). 51 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
LOLOS, CHERYL	138	170
Medstar Ambulance Inc Ambulance Service Provider · Sparta, IL	59	115
Satyen Patel Hospitalist · Belleville, IL	35	86
Christopher Norbet Diagnostic Radiology · Springfield, IL	35	64
Mission Care Of Illinois Llc Ambulance Service Provider · Belleville, IL	34	61
Mohammad Vakassi Cardiology · Saint Louis, MO	32	74
DUMONTIER, CHARLES	27	45
Aaron Settler Diagnostic Radiology · Springfield, IL	27	37
Jayant Amberker Diagnostic Radiology · Belleville, IL	24	36
James Farn Diagnostic Radiology · Springfield, IL	23	33
HOLDENER, GREGORY	23	47
Adam Taves Diagnostic Radiology · St. Charles, MO	22	33

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