What is Mark Shields's specialty?

Mark Shields (NPI 1366411555) is a Medicare-billing provider whose primary specialty is Internal Medicine in Laguna Hills, CA.

Where does Mark Shields practice?

Mark Shields practices in Laguna Hills, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1366411555.

How much does Medicare pay Mark Shields?

Mark Shields (NPI 1366411555) received approximately $78K in total Medicare Part B payments, serving 248 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1366411555

Mark ShieldsMD

Internal MedicineLaguna Hills, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

816

Unique beneficiaries

—

Total services

1,055

Distinct HCPCS

Medicare payment

$75K

Peer benchmark

Total Medicare services vs. 10,499 Internal Medicine providers in CA — above median (cohort median 531).

PRESCRIBING · PART D · 2024

Total Rx claims

6,902

Beneficiaries

—

Total drug cost

$296K

Distinct drugs

116

Brand share

17.5%

Top prescribed drugs

Atorvastatin Calcium453 claims

Losartan Potassium256 claims

Amlodipine Besylate251 claims

Levothyroxine Sodium242 claims

Pantoprazole Sodium217 claims

QUALITY · MIPS · 2024

Final MIPS score

87.5

Quality

85.3

Cost

78.7

Improvement activities

40.0

Promoting interop.

93.0

Payment adjustment

0.52%

Individual

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

No data available for this provider in 2024.

REFERRAL NETWORK

Where Mark Shields'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). 12 inbound referrers · 25 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
SADDLEBACK MEMORIAL MEDICAL CENTER	152	641
HERREN ENTERPRISES INC	29	87
Elliott Fankuchen Diagnostic Radiology · Laguna Beach, CA	20	66
WAVE IMAGING LLC	19	40
MEMORIALCARE HOME HEALTH - LLC	18	51
Unilab Corporation Clinical Laboratory · West Hills, CA	18	48
SUTHERLAND, JAMES	14	40
SZYMANOWSKI, JEREMY	13	29
Kimvir Dhillon Endocrinology · Laguna Hills, CA	13	29
Erik Pasin Urology · Mission Viejo, CA	12	79
Ronald Gim Cardiology · Laguna Hills, CA	11	27
HARRIS HISTOLOGY SERVICES	11	30

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
SADDLEBACK MEMORIAL MEDICAL CENTER	91	339
Laboratory Corporation Of America Clinical Laboratory · San Diego, CA	33	110
WAVE IMAGING LLC	29	66
Daniel Mckenzie Dermatology · Laguna Hills, CA	22	86
HERREN ENTERPRISES INC	20	69
Tze-Kong Meng Diagnostic Radiology · Laguna Beach, CA	19	69
Erik Pasin Urology · Mission Viejo, CA	18	65
Ramin Rabbani Cardiology · Laguna Hills, CA	18	82
HARRIS HISTOLOGY SERVICES	17	38
MEMORIALCARE HOME HEALTH - LLC	17	37
Unilab Corporation Clinical Laboratory · West Hills, CA	16	44
Sasan Ghaffari Cardiology · Laguna Hills, CA	15	59

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