William Francis Callahan, O.D.
Optometrist · Marshfield, MA
William Francis Callahan, O.D. is an optometrist with a practice address in Marshfield, Massachusetts, and NPI 1568536357, issued on Nov 20, 2006. Check the license (Massachusetts 3071, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Francis Callahan
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 3071 MA
Self-reported in NPPES; status is on the state search - Practice location
- 462 Plain St, Marshfield, MA 02050
- Phone
- (781) 837-9956
- Enumerated
- Nov 20, 2006
- Record last updated
- Aug 23, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (781) 837-9950
- Medicaid ID
- 0352276 MA
- Medicare enrollment
- Enrolled (PECOS I20120314000702); accepts Medicare assignment
- Medical or professional school
- New England College Of Optometry, 1983
- Entity
- Type 1 · individual
8 nearest optometrist records → All 1,501 in Massachusetts → Look up another NPI →
Also registered at 462 Plain St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Bastien, D.D.S.Dentist1285667154
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- Jeremy Zuniga, D.D.S., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1477848661
Verify William Francis Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 3071Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average optometrist in 2024
75 Medicare Part D claims for 35 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Restasis12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
William Francis Callahan among 1,501 optometrist records in Massachusetts
William Francis Callahan, O.D. is one of 1,501 optometrist records with a practice address in Massachusetts. 66% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 56% newer
- In a Medicare fileYes · 66% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1983 · median 2008 among the 933 with a school on file
- Record last updated2012 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in Massachusetts
There are 1,501 optometrist records in Massachusetts.
All 1,501 in Massachusetts → Every provider in Marshfield → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Westin Cohen, ODMansfield, MA 020481952092595
- Elise D'Amiano, ODMedfield, MA 020521609935725
- Joel Hayden, ODMansfield, MA 020481245308733
- Ashlynne Horton, O.D.Mansfield, MA 020481659152239
- Susan Kwaiter-Sadler, O.D.Medfield, MA 020521629100144
- Mursal Langer, ODMansfield, MA 020481437735149
- Antonia Lettrick, ODMansfield, MA 020481447930581
- Timothy Lynch, ODMansfield, MA 020481437174547
Common questions
What is William Francis Callahan, O.D.'s NPI number?
William Francis Callahan, O.D.'s National Provider Identifier (NPI) is 1568536357, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Francis Callahan, O.D. located?
The NPPES record lists a practice address at 462 Plain St, Marshfield, MA, 02050. Phone: (781) 837-9956. Providers update this record themselves, so call before visiting.
How can I verify William Francis Callahan, O.D.'s license?
NPPES lists Massachusetts license number 3071, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does William Francis Callahan, O.D. prescribe under Medicare Part D?
In 2024, William Francis Callahan, O.D. had 75 Medicare Part D claims for 35 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.