What is Gretchen Diemer's specialty?

Gretchen Diemer (NPI 1164457289) is a Medicare-billing provider whose primary specialty is Internal Medicine in Philadelphia, PA.

Where does Gretchen Diemer practice?

Gretchen Diemer practices in Philadelphia, PA, based on the location reported in the CMS Medicare provider datasets for NPI 1164457289.

How much does Medicare pay Gretchen Diemer?

Gretchen Diemer (NPI 1164457289) received approximately $13K in total Medicare Part B payments, serving 54 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1164457289

Gretchen DiemerM.D.

Internal MedicinePhiladelphia, PAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

169

Distinct HCPCS

Medicare payment

$13K

Peer benchmark

Total Medicare services vs. 4,434 Internal Medicine providers in PA — bottom quintile (cohort median 550).

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.

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (1)

CCN 390027

Hospital

REFERRAL NETWORK

Where Gretchen Diemer'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). 10 inbound referrers · 13 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
THOMAS JEFFERSON UNIVERSITY HOSPITALS INC	71	327
City Of Philadelphia Ambulance Service Provider · Philadelphia, PA	17	73
David Karasick Diagnostic Radiology · Philadelphia, PA	17	76
Joanne Kim Internal Medicine · Philadelphia, PA	17	295
Lily Ackermann Internal Medicine · Philadelphia, PA	15	155
FALCK NORTHEAST CORP.	14	52
Terri Tuckman Diagnostic Radiology · Philadelphia, PA	12	36
Bryan Hess Infectious Disease · Philadelphia, PA	12	124
David Wiener Cardiology · Philadelphia, PA	11	37
Quest Diagnostics Clinical Laboratories Inc Clinical Laboratory · Norristown, PA	11	41

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
THOMAS JEFFERSON UNIVERSITY HOSPITALS INC	49	184
FALCK NORTHEAST CORP.	27	131
John Stewart Internal Medicine · Philadelphia, PA	19	372
Cindy Finden Diagnostic Radiology · Philadelphia, PA	16	67
Achala Donuru Diagnostic Radiology · Philadelphia, PA	16	52
Emily Stewart Hospitalist · Lebanon, NH	14	78
Paras Lakhani Diagnostic Radiology · Philadelphia, PA	13	38
City Of Philadelphia Ambulance Service Provider · Philadelphia, PA	13	26
Baskaran Sundaram Diagnostic Radiology · Philadelphia, PA	13	35
Lily Ackermann Internal Medicine · Philadelphia, PA	12	72
Joanne Kim Internal Medicine · Philadelphia, PA	12	182
David Karasick Diagnostic Radiology · Philadelphia, PA	11	41

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