Doctor profile · Federal record
Dr. William Callahan, O.D.
Optometrist (CMS: Optometry) · Marshfield, MA
- NPI 1568536357
- Accepts Medicare
- 43 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
462 Plain St, Suite 104
Marshfield, MA 020502731
(781) 837-9956
fax (781) 837-9950
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- August 23, 2012
- Year of graduation
- 1983 — 43 yrs since
- Specialty taxonomy
- 152W00000X — NUCC code
- State license (1)
- Massachusetts #3071
- Medicaid
- MA #0352276
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1568536357. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
619
Distinct HCPCS
7
Medicare allowed
$46,994
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
92012 |
Established patient problem focused exam of visual system | 183 | 118 | $93 | |
92250 |
Photography of the retina | 115 | 111 | $36 | |
92285 |
Photography of content of eyes | 112 | 110 | $24 | |
92083 |
Exam of visual field with extended testing | 76 | 74 | $65 | |
92014 |
Established patient complete exam of visual system | 72 | 72 | $131 | |
92004 |
New patient complete exam of visual system | 50 | 50 | $155 | |
92002 |
New patient problem focused exam of visual system | 11 | 11 | $89 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 88. This provider delivers 7.0× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
29
Patients
0
Total drug cost
$20,889
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Restasis (Cyclosporine) | Brand | 18 | 0 | $20,854 |
| Levofloxacin | Generic | 11 | 0 | $35 |
Frequently asked questions
What is Dr. William Callahan's medical specialty?
Dr. William Callahan practices Optometrist in Marshfield, MA.
Where does Dr. William Callahan practice?
Dr. William Callahan practices at 462 Plain St, Marshfield, MA 020502731. Office phone: 7818379956.
What is Dr. William Callahan's NPI?
Dr. William Callahan's National Provider Identifier (NPI) is 1568536357, issued by NPPES.
Does Dr. William Callahan accept Medicare assignment?
Yes. Dr. William Callahan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Callahan commonly perform?
Top Medicare-reported procedures in 2023: Established patient problem focused exam of visual system (HCPCS 92012); Photography of the retina (HCPCS 92250); Photography of content of eyes (HCPCS 92285). Source: CMS Medicare Physician & Other Practitioners file.