Dr. William D. Mosier, MD
- Medicare services, 2024
- 2,749
- Medicare patients, 2024
- 905
- Part D claims, 2024
- 4,503
- MIPS score, 2024
- 87
- Hospital affiliations
- 1
- Practice address
- 265 Laguna Rd, Fullerton, CA 92835-2515
- Practice phone
- Call (714) 871-2570
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
William D. Mosier, M.d., Inc., A Professional Medical Corporation
Eye care practice · Fullerton, California
Find Dr. Mosier's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. William D. Mosier is an ophthalmologist in Fullerton, California
Dr. Mosier practices at William D. Mosier, M.d., Inc., A Professional Medical Corporation in Fullerton, California.
Dr. Mosier's NPI, 1063553378, was assigned on February 9, 2007. Dr. Mosier graduated from Universidad Nacional Autonoma de Honduras in 1982. Dr. Mosier holds California license A41428.
- NPI
- 1063553378NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638230790
- NPI enumeration date
- February 9, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 871-2570
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William D. Mosier practices at William D. Mosier, M.d., Inc., A Professional Medical Corporation in Fullerton, California
Dr. Mosier's primary practice is William D. Mosier, M.d., Inc., A Professional Medical Corporation, at 265 Laguna Rd, Fullerton, CA 92835-2515. The practice phone is (714) 871-2570.
- William D. Mosier, M.d., Inc., A Professional Medical Corporation265 Laguna Rd, Fullerton, CA 92835-2515Phone(714) 871-2570
Source: Dmand AI Affiliation Data
Dr. William D. Mosier is affiliated with 2 sites of care and 1 medical group
Dr. Mosier's primary practice is William D. Mosier, M.d., Inc., A Professional Medical Corporation in Fullerton, California. Dr. Mosier is also affiliated with Providence St. Jude Medical Center. Dmand AI also links Dr. Mosier to 1 more medical group, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. William D. Mosier's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mosier practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| William D. Mosier, M.d., Inc., A Professional Medical Corporation | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William D. Mosier is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Mosier's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Mosier is board certified in ophthalmology by the American Board of Ophthalmology. Dr. Mosier is licensed in California.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
Clinical focus
Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, cold sores or genital herpes, conjunctivitis, dry eye, eyelid inflammation and glaucoma among the conditions Dr. Mosier treats.
Ophthalmologists near Dr. Mosier
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William D. Mosier billed Medicare for 2,749 services in 2024
CMS data shows 2,749 Medicare services from Dr. Mosier across 13 procedure codes in 2024, for 905 Medicare patients. Medicare paid $173,916 for them.
Dr. Mosier's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,1072024: 2,67427%
- Surgery
- 2023: 502024: 4020%
- Imaging
- 2023: 182024: 3594%
Where Dr. Mosier's Medicare services took place, 2024
- In an office2,70999%
- In a facility401%
Dr. Mosier compared with the California median for ophthalmologists, 2024
- Dr. Mosier
- California median
- Medicare services
- 2,749vs 1,0792.5 times
- Medicare patients
- 905vs 4212.1 times
- Part D claims
- 4,419vs 6187.2 times
Medians across 2,568 ophthalmologists in California with Dmand AI profiles that report each measure.
Dr. Mosier's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Mosier?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mosier and other ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William D. Mosier treated 905 Medicare patients in 2024, average age 78
CMS counts 905 Medicare patients who saw Dr. Mosier in 2024. The largest group is 75 to 84, with 385 patients. 75% of them have high cholesterol, and 68% have high blood pressure. 3% are also on Medicaid. Their average risk score is 1.20, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Mosier's median patient age at 77, with 59% women.
Dr. Mosier's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Mosier's Medicare patients by sex, 2024
- Women53559%
- Men37041%
Chronic conditions among Dr. Mosier's Medicare patients, 2024
- High cholesterol75%
- High blood pressure68%
- Arthritis45%
- Diabetes32%
- Osteoporosis26%
- Chronic kidney disease24%
- Ischemic heart disease21%
- Atrial fibrillation18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Mosier's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William D. Mosier wrote 4,503 Medicare Part D claims in 2024
In 2024, Dr. Mosier wrote 4,503 Medicare Part D claims for 957 patients. 55% of them were for generic drugs. CMS names the drug for 4,419 of them, across 25 drugs with 11 or more claims each, at $482,487 in total drug cost. In 2023, CMS named 3,353 claims across 21 drugs.
Dr. Mosier's Part D claims by kind of drug, 2024
- Generic2,490 claims55%
- Brand-name2,013 claims45%
Dr. Mosier's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,3532024: 4,41932%
Drugs named by CMS: 25 in 2024, 21 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William D. Mosier scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Mosier for performance year 2024, reported as part of a group. Dr. Mosier accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 71 procedures of cataract surgery by Dr. Mosier, more than 69% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Mosier's MIPS scores, performance year 2024
- 87of 100Final score
- 99.9of 100Quality
- 40of 100Improvement Activities
- 56of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Mosier ranks in Medicare procedure volume
- Cataract surgery
- 69th percentile71 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. William D. Mosier received $5,096 in industry payments from 2016 to 2025
CMS Open Payments shows 268 general payments to Dr. Mosier from 24 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 94% of the total. Sun Pharmaceutical Industries Inc. paid the most, $1,748.
General payments to Dr. Mosier by program year, 2016 to 2025
General payments to Dr. Mosier by kind, 2016 to 2025
- Food and beverage$4,78494%
- Travel and lodging$2655%
- Entertainment$471%
Companies that paid Dr. Mosier the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William D. Mosier graduated from Universidad Nacional Autonoma de Honduras
Dr. Mosier graduated from Universidad Nacional Autonoma de Honduras in 1982.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. William D. Mosier accepts plans from 23 insurance carriers
Dr. Mosier is in network with 23 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- Humana
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Alliant Health Plans
- +15 more carriersWith a free account
Plan types Dr. Mosier accepts, by number of carriers
- PPO14
- HMO12
- Medicare9
- POS7
- EPO5
Source: Dmand AI Insurance Network Data
Sources for Dr. William D. Mosier's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William D. Mosier
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William D. Mosier's NPI number?
Dr. William D. Mosier's NPI number is 1063553378. It was assigned on February 9, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. William D. Mosier?
Dr. William D. Mosier is an ophthalmologist in Fullerton, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. William D. Mosier practice?
Dr. Mosier practices at 265 Laguna Rd, Fullerton, CA 92835-2515. Dr. Mosier's primary practice is William D. Mosier, M.d., Inc., A Professional Medical Corporation in Fullerton, California. Dmand AI also links Dr. Mosier to 1 medical group.
What is Dr. William D. Mosier's office phone number?
The practice phone on file for Dr. Mosier is (714) 871-2570.
What is Dr. William D. Mosier's medical license number?
Dr. Mosier holds California license A41428.
Which hospitals is Dr. William D. Mosier affiliated with?
Dr. Mosier is affiliated with Providence St. Jude Medical Center.
Does Dr. William D. Mosier accept Medicare?
Yes. CMS data shows Dr. Mosier billed Medicare for 2,749 services in 2024, and Dr. Mosier accepts Medicare assignment.
What is Dr. William D. Mosier's MIPS score?
Dr. Mosier's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. William D. Mosier see?
CMS counts 905 Medicare patients who saw Dr. Mosier in 2024, with an average age of 78.
Is Dr. William D. Mosier board certified?
Yes. Dr. Mosier is board certified in ophthalmology by the American Board of Ophthalmology.
Show 6 more questionsShow fewer questions
What services does Dr. William D. Mosier bill to Medicare?
In 2024, Dr. Mosier's most billed Medicare services were eye exam or test (92014), eye exam or test (92133) and eye exam or test (92012).
Where did Dr. William D. Mosier go to medical school?
Dr. Mosier graduated from Universidad Nacional Autonoma de Honduras in 1982.
What drugs does Dr. William D. Mosier prescribe most?
In 2024 Medicare Part D data, Dr. Mosier's most prescribed drugs by claims were Latanoprost, Timolol Maleate and Dorzolamide-Timolol.
Has Dr. William D. Mosier received payments from drug or device companies?
CMS Open Payments shows $5,096 in general payments to Dr. Mosier from 24 companies from 2016 to 2025. The largest total came from Sun Pharmaceutical Industries Inc.
How long has Dr. William D. Mosier been practicing?
Dr. Mosier graduated from medical school in 1982, 44 years ago.
What insurance does Dr. William D. Mosier accept?
Dr. Mosier is in network with 23 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 14. Check the plan with the practice before a visit.
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