What is Mark Johnson's specialty?

Mark Johnson (NPI 1861421372) is a Medicare-billing provider whose primary specialty is Gastroenterology in Chula Vista, CA.

Where does Mark Johnson practice?

Mark Johnson practices in Chula Vista, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1861421372.

How much does Medicare pay Mark Johnson?

Mark Johnson (NPI 1861421372) received approximately $42K in total Medicare Part B payments, serving 103 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1861421372

Mark JohnsonM.D.

GastroenterologyChula Vista, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

167

Unique beneficiaries

—

Total services

324

Distinct HCPCS

Medicare payment

$33K

Peer benchmark

Total Medicare services vs. 1,398 Gastroenterology providers in CA — below median (cohort median 750).

PRESCRIBING · PART D · 2024

Total Rx claims

125

Beneficiaries

—

Total drug cost

$3K

Distinct drugs

Brand share

9.6%

Top prescribed drugs

Omeprazole59 claims

Dicyclomine Hcl26 claims

Fluoxetine Hcl14 claims

Pantoprazole Sodium14 claims

Sodium Chloride/Nahco3/Kcl/Peg12 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

No data available for this provider in 2024.

REFERRAL NETWORK

Where Mark Johnson'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 · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Unilab Corporation Clinical Laboratory · West Hills, CA	72	239
American Medical Response Ambulance Service, Inc. Ambulance Service Provider · San Diego, CA	52	211
Harold Pimenta Interventional Cardiology · La Jolla, CA	43	252
Trevor Nelson Interventional Radiology · La Jolla, CA	39	207
HARRISON, NANCY	36	104
Otay Lakes Surgery Center, Llc Ambulatory Surgical Center · Chula Vista, CA	26	55
Carla Stayboldt Pathology · San Diego, CA	25	83
Ross Christensen Interventional Radiology · La Jolla, CA	25	117
SHARP CHULA VISTA MEDICAL CENTER	24	52
Vitali Aizin Cardiology · Chula Vista, CA	23	146
Victor Coelho Internal Medicine · Fort Mill, SC	20	91
Kevin Ishioka Diagnostic Radiology · La Jolla, CA	19	48

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