WILLIAM D. LAMM M.D.
NPI 1639156938
Family Medicine in Cumberland, MD
About William D. Lamm M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM D. LAMM M.D. (NPI 1639156938) is an individual family medicine provider in Cumberland, Maryland, licensed in Maryland (D0025406) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Western Maryland Regional Medical Center, and is a graduate of University Of Maryland School Of Medicine (1980).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 9
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
William D. Lamm M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show William Lamm reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Cumberland, MD 21502
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 16 clinicians in this Medicare group
Cumberland, MD 21502
- Reassigned Medicare billing, Maryland enrollment
- 7 clinicians in this Medicare group
Rockville, MD 20850
- Reassigned Medicare billing, Maryland enrollment
- 301 clinicians in this Medicare group
Elkton, MD 21921
- Reassigned Medicare billing, Maryland enrollment
- 104 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Western Maryland Regional Medical Center
Acute Care Hospitals · Cumberland, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21502 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CUMBERLAND, MD 21502
CUMBERLAND, MD 21502
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Lamm's NPI number?
The NPI number for William Lamm is 1639156938. It was assigned to this individual provider in the NPPES registry on December 28, 2005.
Where is William Lamm located?
William Lamm practices at 12500 Willowbrook Rd, Cumberland, MD 21502. The listed phone number is (240) 964-8564.
What is William Lamm's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Lamm enrolled in Medicare?
Yes. William Lamm is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for William Lamm's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Lamm reassigns Medicare benefits to 4 organizations: Mep Observation Services LLC (Cumberland, MD), Transitioncare LLC (Cumberland, MD), Mep Health, LLC (Rockville, MD) and Usacs Integrated Acute Care Services Of Maryland, LLC (Elkton, MD). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Lamm's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Lamm affiliated with any hospitals?
According to CMS data, William Lamm is affiliated with Western Maryland Regional Medical Center.
When was this NPI record last updated?
The NPPES record for William Lamm was last updated on November 11, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# William D. Lamm, M.D. · NPI 1639156938
Family Medicine physician in Cumberland, Maryland. Individual provider, active in the CMS NPPES registry since December 28, 2005.
## Identity
- **NPI:** 1639156938 (Entity type: Individual)
- **Enumerated:** December 28, 2005
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** D0025406 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 12500 WILLOWBROOK RD, Cumberland, MD 21502-6393
- **Phone:** (240) 964-8564 · **Fax:** (240) 964-8563
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Mep Observation Services LLC (NPI 1093003550, Cumberland, MD); Transitioncare LLC (NPI 1689925000, Cumberland, MD); Mep Health, LLC (NPI 1164483558, Rockville, MD); Usacs Integrated Acute Care Services Of Maryland, LLC (NPI 1922598929, Elkton, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Maryland School Of Medicine, class of 1980
## Record status
- **NPPES last updated:** November 11, 2010
- **Other identifiers:** Other P00135061 (MD); Other P00800399 (MD); Medicare PIN 132239Y1Z (MD); and 6 more
---
Source: [NPI Profile](https://npiprofile.com/npi/1639156938) · Data from the CMS NPPES public registry.