What is John Wallmark's specialty?

John Wallmark (NPI 1689755365) is a Medicare-billing provider whose primary specialty is Hematology-Oncology in Rockville, MD.

Where does John Wallmark practice?

John Wallmark practices in Rockville, MD, based on the location reported in the CMS Medicare provider datasets for NPI 1689755365.

How much does Medicare pay John Wallmark?

John Wallmark (NPI 1689755365) received approximately $3.4M in total Medicare Part B payments, serving 868 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1689755365

John WallmarkM.D.

PRACTICEASSOCIATES IN ONCOLOGY HEMATOLOGY PCSee all providers at this practice →

Hematology-OncologyRockville, MDI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

4,222

Unique beneficiaries

—

Total services

125,093

Distinct HCPCS

Medicare payment

$1.7M

Peer benchmark

Total Medicare services vs. 175 Hematology-Oncology providers in MD — top quintile (cohort median 11,156).

PRESCRIBING · PART D · 2024

Total Rx claims

837

Beneficiaries

—

Total drug cost

$4.2M

Distinct drugs

Brand share

37.0%

Top prescribed drugs

Letrozole205 claims

Rivaroxaban56 claims

Anastrozole55 claims

Warfarin Sodium49 claims

Acyclovir38 claims

QUALITY · MIPS · 2024

Final MIPS score

97.5

Quality

92.1

Cost

0.0

Improvement activities

40.0

Promoting interop.

100.0

Payment adjustment

0.95%

Individual

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$3K

Payment records

By payment type

Food and Beverage$2K

Long term medical supply or device loan$1,000

Education$100

Top paying entities

Food and Beverage$2K

Long term medical supply or device loan$1,000

Education$100

REFERRAL NETWORK

Where John Wallmark'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). 23 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Joseph Haggerty Hematology-Oncology · Rockville, MD	95	1,014
George Sotos Hematology-Oncology · Rockville, MD	91	628
AGRAWAL, MANISH	89	641
Quest Diagnostics Incorporated Md Clinical Laboratory · Baltimore, MD	73	238
SUBURBAN HOSPITAL, INC.	64	399
Carolyn Hendricks Hematology-Oncology · Bethesda, MD	32	218
William Craig Diagnostic Radiology · Orlando, FL	26	85
Renu Berry Diagnostic Radiology · Germantown, MD	23	74
Huijung Kim Diagnostic Radiology · Washington, DC	19	38
Stephen Fine Diagnostic Radiology · Washington, DC	17	38
Zahide Erkmen Diagnostic Radiology · Germantown, MD	16	53
CASANOVA, VELMA	15	44

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