Active NPI 1063553378 Individual Practitioner Male Practitioner

Dr. William D Mosier , MD

Ophthalmology • Fullerton, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. William Mosier, MD is a certified Ophthalmology practicing in Fullerton, CA. With approximately 43 years of clinical experience since graduating from University Of California, Irvine, California College Of Medicine in 1983, Dr. Mosier delivers high-quality medical care to the local community at 265 LAGUNA RD.

Dr. Mosier is affiliated with William D Mosier Md Inc A Professional Medical Corporation and accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient complete exam of visual system, imaging of optic nerve, established patient problem focused exam of visual system. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

265 Laguna Rd

Fullerton, CA 928352515

Telephone 7148712570

Fax 7144412020

Associated Practice Facility / Clinic

🏢 William D. Mosier Md Facility NPI 1841542271

Medicare Profile & Education

Medical School

University Of California, Irvine, California College Of Medicine

Graduation Year

1983

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Ophthalmology in Fullerton, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

43 Yrs +19.9 yrs vs City Avg

City Avg: 23.1 Yrs

State Avg: 29.5 Yrs

Regional Practice Density

20 Specialists

Practicing in Fullerton, CA (3116 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

72.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Mosier (43 Years) 43 Yrs

Fullerton Specialty Average (23.1 Years) 23.1 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	799	724	$200.00	$138.73
92133 Imaging of optic nerve	539	366	$100.00	$38.49
92012 Established patient problem focused exam of visual system	385	274	$150.00	$98.54
92083 Exam of visual field with extended testing	227	213	$200.00	$70.64
92250 Photography of the retina	225	218	$200.00	$40.53
92134 Imaging of retina	180	163	$100.00	$43.49
92004 New patient complete exam of visual system	134	134	$275.00	$161.74
92136 Measurement of corneal curvature and depth of eye	87	36	$170.69	$25.43
92132 Imaging of front third of eye	47	45	$100.00	$32.77
66984 Removal of cataract with insertion of lens	40	29	$3000.00	$581.74
92025 Ct scan of cornea	40	37	$150.00	$40.27
76514 Ultrasound scan of cornea to determine thickness	35	33	$175.00	$11.53
92002 New patient problem focused exam of visual system	11	11	$175.00	$94.10

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	672	621	$200.00	$141.16
92133 Imaging of optic nerve	412	318	$100.00	$39.57
92012 Established patient problem focused exam of visual system	320	243	$150.00	$100.08
92250 Photography of the retina	165	161	$200.00	$41.50
92083 Exam of visual field with extended testing	163	157	$200.00	$70.43
92134 Imaging of retina	138	130	$100.00	$44.13
92004 New patient complete exam of visual system	88	88	$275.00	$166.71
92136 Measurement of corneal curvature and depth of eye	80	37	$170.63	$25.28
66984 Removal of cataract with insertion of lens	36	26	$3000.00	$589.20
92025 Ct scan of cornea	35	35	$150.00	$40.74
92132 Imaging of front third of eye	34	34	$100.00	$33.85
76514 Ultrasound scan of cornea to determine thickness	18	18	$175.00	$11.74
66821 Removal of recurring cataract in lens capsule using a laser	14	13	$1100.00	$343.89

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	697	621	$200.00	$142.34
92133 Imaging of optic nerve	382	282	$100.00	$40.15
92012 Established patient problem focused exam of visual system	300	218	$150.00	$100.95
92134 Imaging of retina	190	169	$100.00	$45.01
92250 Photography of the retina	170	161	$200.00	$41.86
92083 Exam of visual field with extended testing	148	144	$200.00	$71.70
92136 Measurement of corneal curvature and depth of eye	146	60	$167.47	$29.23
92004 New patient complete exam of visual system	88	88	$275.00	$168.41
66984 Removal of cataract with insertion of lens	70	48	$3000.00	$594.05
92025 Ct scan of cornea	58	58	$150.00	$37.05
76514 Ultrasound scan of cornea to determine thickness	35	35	$175.00	$11.96
92132 Imaging of front third of eye	22	21	$100.00	$33.20
66821 Removal of recurring cataract in lens capsule using a laser	14	14	$1100.00	$345.60
66982 Complex removal of cataract with insertion of prosthetic lens	13	11	$4000.00	$810.46

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	659	603	$200.00	$143.69
92133 Imaging of optic nerve	366	261	$100.00	$40.77
92012 Established patient problem focused exam of visual system	300	223	$150.00	$101.37
92134 Imaging of retina	182	177	$100.00	$45.85
92250 Photography of the retina	156	153	$200.00	$44.68
92136 Measurement of corneal curvature and depth of eye	139	61	$160.43	$31.63
92083 Exam of visual field with extended testing	137	131	$200.00	$71.97
92004 New patient complete exam of visual system	99	99	$275.00	$170.37
66984 Removal of cataract with insertion of lens	66	51	$3000.00	$603.80
92025 Ct scan of cornea	59	59	$150.00	$38.09
76514 Ultrasound scan of cornea to determine thickness	25	24	$175.00	$11.78
92132 Imaging of front third of eye	15	14	$100.00	$34.39

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	648	615	$200.00	$143.45
92133 Imaging of optic nerve	300	245	$100.00	$41.71
92012 Established patient problem focused exam of visual system	296	216	$150.00	$101.59
92134 Imaging of retina	169	160	$100.00	$45.76
92250 Photography of the retina	159	153	$200.00	$52.26
92136 Measurement of corneal curvature and depth of eye	133	59	$160.15	$35.47
92083 Exam of visual field with extended testing	103	102	$200.00	$73.65
92004 New patient complete exam of visual system	93	93	$275.00	$171.91
66984 Removal of cataract with insertion of lens	66	49	$3000.00	$602.15
92025 Ct scan of cornea	55	55	$150.00	$37.85
92002 New patient problem focused exam of visual system	17	17	$175.00	$97.13
76514 Ultrasound scan of cornea to determine thickness	13	13	$175.00	$12.71

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	592	551	$200.00	$142.43
92133 Imaging of optic nerve	309	233	$100.00	$40.88
92012 Established patient problem focused exam of visual system	217	177	$150.00	$99.33
92134 Imaging of retina	142	135	$100.00	$45.60
92250 Photography of the retina	141	137	$200.00	$57.47
92083 Exam of visual field with extended testing	115	111	$200.00	$73.32
92136 Measurement of corneal curvature and depth of eye	111	46	$160.14	$39.45
92004 New patient complete exam of visual system	62	62	$275.00	$170.67
66984 Removal of cataract with insertion of lens	58	40	$3000.00	$718.50
92025 Ct scan of cornea	44	44	$150.00	$39.23
76514 Ultrasound scan of cornea to determine thickness	20	20	$175.00	$13.17

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	603	561	$200.00	$141.32
92133 Imaging of optic nerve	305	223	$100.00	$41.25
92012 Established patient problem focused exam of visual system	199	177	$150.00	$98.66
92250 Photography of the retina	149	145	$200.00	$64.95
92083 Exam of visual field with extended testing	127	124	$200.00	$73.42
92134 Imaging of retina	110	104	$100.00	$46.70
92136 Measurement of corneal curvature and depth of eye	95	41	$160.79	$43.61
66984 Removal of cataract with insertion of lens	45	33	$3000.00	$710.27
92004 New patient complete exam of visual system	39	39	$275.00	$168.68
76514 Ultrasound scan of cornea to determine thickness	24	24	$175.00	$15.91

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
92014 Established patient complete exam of visual system	653	619	$200.00	$136.08
92133 Imaging of optic nerve	400	299	$100.00	$40.16
92012 Established patient problem focused exam of visual system	278	237	$150.00	$94.44
92083 Exam of visual field with extended testing	170	166	$200.00	$72.46
92250 Photography of the retina	162	159	$200.00	$74.26
92136 Measurement of corneal curvature and depth of eye	131	54	$159.73	$46.76
92134 Imaging of retina	81	80	$100.00	$45.40
66984 Removal of cataract with insertion of lens	78	54	$3000.00	$690.59
92004 New patient complete exam of visual system	41	41	$275.00	$163.74
76514 Ultrasound scan of cornea to determine thickness	33	33	$175.00	$15.42
66821 Removal of recurring cataract in lens capsule using a laser	14	14	$1100.00	$343.33

Medical Specialties & State Licenses

Ophthalmology Primary Specialty

NUCC Taxonomy Code: 207W00000X

State License CA A41428

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

00A414280 (CA)

Commercial Insurance / Payer ID Rail Road Medicare

P00665890 (CA)

Hospital & Practice Group Affiliations

William D Mosier Md Inc A Professional Medical Corporation

265 Laguna Rd, Fullerton, CA 928352515

Phone: 7148712570

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

2 Associated Practitioners

Dr. Thao Vu , OD

Optometrist

NPI 1568513521

Doctor of Optometry

Matthew Nobe

Ophthalmology

NPI 1821313461

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active April 11, 2014

NPI status registered as active in NPPES database

📍

Updated Practice Location April 11, 2014

Registered at 265 LAGUNA RD, FULLERTON, CA 928352515 (Tel: 7148712570)

📍

Updated Business Mailing Address April 11, 2014

Registered at 265 LAGUNA RD, FULLERTON, CA 928352515 (Tel: 7148712570)

👤

Provider Name / Credentials Updated April 11, 2014

Recorded as WILLIAM MOSIER, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) April 11, 2014

Ophthalmology (License #A41428 in CA)

🟢

Initial NPI Registration & Enumeration February 09, 2007

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1063553378

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: February 09, 2007

Last Update: April 11, 2014

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

265 Laguna Rd

Fullerton, CA 928352515

Phone: 7148712570

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.