Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Peter Tebet Greenspan, MD
Pediatrics Physician in Waltham, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1295725885
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Registry record
Entity type Individual (Type 1)
Name Dr. Peter Tebet Greenspan
Credential MD
Sex Male
Practice address 40 2nd Ave, Mass General West Medical Group Ste 400, Waltham, MA, 02451
Phone (781) 487-4340
Fax (781) 487-4341
Enumeration date Oct 25, 2005
Last updated in NPPES Jun 5, 2014
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| B51049 | Other | MA | BCBS MA |
| 044159 | Other | MA | TUFTS HEALTH PLAN |
| 6164595 | Medicaid | MA | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Peter Greenspan practice?
The practice location on file with NPPES is in Waltham, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Peter Greenspan?
The National Provider Identifier (NPI) for Peter Greenspan is 1295725885, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Leslie Vensel Internal Medicine Physician · Waltham, MA NPI 1336139021 Abdul Asmal Endocrinology, Diabetes & Metabolism Physician · Waltham, MA NPI 1144210832 Beth Mccabe Pediatrics Physician · Waltham, MA NPI 1114908902 Carey York Best Obstetrics & Gynecology Physician · Waltham, MA NPI 1194707836 Jonathan Winickoff Pediatrics Physician · Waltham, MA NPI 1720049760 John Mcnemar Certified Registered Nurse Anesthetist · Waltham, MA NPI 1295798890 Nancy Gracin Cardiovascular Disease Physician · Waltham, MA NPI 1003852526 Mary Sabolsi Infectious Disease Physician · Waltham, MA NPI 1386679439
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-06-05.