Quick answers
- Where does William B. Lapin see patients?
- Medicare's clinician data lists 2 practice locations, including Hartford, CT and South Hadley, MA. Call before your visit to confirm the address.
- What is William B. Lapin's specialty?
- Medicare lists Rheumatology as the primary specialty.
- Does William B. Lapin accept Medicare assignment?
- Yes. Medicare's clinician data says William B. Lapin accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William B. Lapin?
- (860) 545-9000, as listed in official Medicare / NPI Registry data.
- What is William B. Lapin's NPI number?
- 1740624741. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William B. Lapin is enrolled with Medicare (CMS data updated 2026-10-02).
- 282 Washington StHartford, CT 06106 (860) 545‑9000
- 84 Willimansett St, Suite CSouth Hadley, MA 01075 (860) 545‑9395
Group practices
Medicare enrollment lists William B. Lapin as a member of this group (CMS data updated 2026-10-02).
- Connecticut Children's Specialty Group, Inc137 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Hartford
Clinicians with the same Medicare primary specialty in Hartford, CT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740624741 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians