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Edit this profileAt a glance
- 265 Laguna Rd, Fullerton, CA 92835
About Dr. Mosier
William D. Mosier, MD is a healthcare provider in Fullerton, CA specializing in ophthalmology. William trained at University of California, Irvine, California College of Medicine, graduating in 1983. According to Medicare claims data, William cared for 2,283 Medicare patients across 2,749 services. The services billed most often include established patient complete exam of visual system, imaging of optic nerve, and established patient problem focused exam of visual system. This provider record is associated with NPI 1063553378.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (714) 871-2570
- Email not available
Practice Locations
265 LAGUNA RD
Fullerton, CA 92835
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
Eye injuries
Inflammation, neurologic, and orbit
Retina & vitreous
Procedures & services
Most searched procedures
Examination and imaging
Cataract and lens
Corneal procedures
Eye diagnostics
Eye injuries
Eyelid surgery
Eyelid, tear duct, and muscle
Glaucoma
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Laser eye surgery
Laser procedures
Laser vision correction
Refractive surgery
Tear duct & Orbit
Procedures Most Often Billed to Medicare
2,749 services · 2,283 patients · 13 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
40 | Less often than most peers in Ophthalmology |
| Ultrasound scan of cornea to determine thickness | Imaging | 76514 |
35 | As often as other peers in Ophthalmology |
| Established patient complete exam of visual system | Treatment | 92014 |
799 | More often than most peers in Ophthalmology |
| Imaging of optic nerve | Treatment | 92133 |
539 | More than most peers in Ophthalmology |
| Established patient problem focused exam of visual system | Treatment | 92012 |
385 | More often than most peers in Ophthalmology |
| Exam of visual field with extended testing | Treatment | 92083 |
227 | More often than most peers in Ophthalmology |
| Photography of the retina | Treatment | 92250 |
225 | More often than most peers in Ophthalmology |
| Imaging of retina | Treatment | 92134 |
180 | As often as other peers in Ophthalmology |
| New patient complete exam of visual system | Treatment | 92004 |
134 | More often than most peers in Ophthalmology |
| Measurement of corneal curvature and depth of eye | Treatment | 92136 |
87 | As often as other peers in Ophthalmology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other eye doctors at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 3
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other eye doctors in Fullerton 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at University of California, Irvine, California College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1983 at University of California, Irvine, California College of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of cataract with insertion of prosthetic lens 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Mosier?
Dr. Mosier is an eye doctor in Fullerton, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology”.
NPI registry
What is Dr. Mosier's address?
Dr. Mosier is listed at 265 Laguna Rd, Fullerton, CA 92835. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Mosier?
The number on file is (714) 871-2570. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Mosier's NPI number?
Dr. Mosier's National Provider Identifier is 1063553378. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Mosier train?
Dr. Mosier attended University of California, Irvine, California College of Medicine, graduating in 1983. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Mosier been practicing?
Dr. Mosier has 43 years experience. Calculated from a graduation year of 1983, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Mosier perform?
According to Medicare billing data, Dr. Mosier performs procedures including removal of cataract with insertion of prosthetic lens; reads or performs imaging such as ultrasound scan of cornea to determine thickness; provides treatments such as established patient complete exam of visual system and imaging of optic nerve. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Mosier confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Mosier. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.