PROVIDER PROFILE · NPI 1063553378

William MosierMD

PRACTICEWILLIAM D. MOSIER MDSee all providers at this practice →

OphthalmologyFullerton, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,283

Unique beneficiaries

—

Total services

2,749

Distinct HCPCS

Medicare payment

$174K

Peer benchmark

Total Medicare services vs. 2,144 Ophthalmology providers in CA — above median (cohort median 1,859).

PRESCRIBING · PART D · 2024

Total Rx claims

4,419

Beneficiaries

—

Total drug cost

$482K

Distinct drugs

Brand share

32.5%

Top prescribed drugs

Latanoprost1,589 claims

Timolol Maleate632 claims

Dorzolamide Hcl/Timolol Maleat615 claims

Brimonidine Tartrate278 claims

Bimatoprost254 claims

QUALITY · MIPS · 2024

Final MIPS score

86.9

Quality

99.9

Cost

56.4

Improvement activities

40.0

Promoting interop.

0.0

Payment adjustment

0.50%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$917

Payment records

By payment type

Food and Beverage$917

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (1)

CCN 050168

Hospital

REFERRAL NETWORK

Where William Mosier'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). 19 inbound referrers · 48 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Victor Lee Pathology · Oceanside, CA	195	463
ST JUDE HOSPITAL INC	192	388
Unilab Corporation Clinical Laboratory · West Hills, CA	61	129
Ramesh Rathod Interventional Cardiology · Fullerton, CA	29	58
UNGER, PHILLIP	19	27
Charles Suh Interventional Cardiology · Fullerton, CA	17	39
Eugene Byun Cardiology · Fullerton, CA	17	34
Daniel Landa Internal Medicine · Fullerton, CA	15	44
Bradley Borsari Internal Medicine · Fullerton, CA	14	65
Robert Rosenberg Dermatology · Fullerton, CA	14	24
Danh Nguyen Diagnostic Radiology · Riverside, CA	13	43
Sean Adrean Ophthalmology · Fullerton, CA	13	30

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
ST JUDE HOSPITAL INC	227	711
Victor Lee Pathology · Oceanside, CA	182	419
Unilab Corporation Clinical Laboratory · West Hills, CA	54	117
Quest Diagnostics Nichols Institute Clinical Laboratory · San Juan Capistrano, CA	32	82
Scott Grant Ophthalmology · Fullerton, CA	27	41
Eugene Byun Cardiology · Fullerton, CA	26	52
HANCOCK, JAMIE	26	33
Ramesh Rathod Interventional Cardiology · Fullerton, CA	25	48
Jay Han Cardiology · Fullerton, CA	23	48
Jesus Vera Interventional Cardiology · Fullerton, CA	22	39
John Kim Ophthalmology · Colton, CA	21	35
UNIVERSITY OF CALIFORNIA IRVINE	21	63

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