Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Karl Proppe, MD
Specialist in Cambridge, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831197102
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. Karl Proppe
Credential MD
Sex Male
Practice address 640 Memorial Dr, Cambridge, MA, 02139
Phone (781) 255-0555
Fax (781) 255-0594
Enumeration date Jul 12, 2005
Last updated in NPPES Jul 8, 2007
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 |
|---|---|---|---|
| 6169767 | 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
What is the NPI number for Karl Proppe?
The National Provider Identifier (NPI) for Karl Proppe is 1831197102, a Type 1 (individual) record in the CMS NPPES registry.
Where does Karl Proppe practice?
The practice location on file with NPPES is in Cambridge, MA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Pathology Services Inc Clinical Medical Laboratory · Cambridge, MA NPI 1861495376 Terence Harrist Specialist · Cambridge, MA NPI 1679576185 Pathology Services Inc Specialist · Cambridge, MA NPI 1104829555 Anne Allan Specialist · Cambridge, MA NPI 1518963552 Sook Bin Woo Specialist · Cambridge, MA NPI 1962490102 Tao Yang Specialist · Cambridge, MA NPI 1740278985
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.