CLIA lab
CLIA 21D1020718: Samuel R Williams MD PA
Catonsville, MD. Certificate and address details from the CMS Provider of Services file for clinical laboratories.
CLIA number 21D1020718 belongs to Samuel R Williams MD PA in Catonsville, MD.
Certificate of Waiver, effective December 30, 2025, expires December 29, 2027.
Active in the CMS Provider of Services file posted October 16, 2026.
Source: CMS Provider of Services File, Clinical Laboratories (CLIA), as of October 16, 2026. Publisher page
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Certificate
- Certificate type
- Certificate of Waiver
- Certificate effective
- December 30, 2025
- Certificate expiration
- December 29, 2027
- Status in the CMS file
- Active (termination code 00)
- Original participation date
- December 30, 2003
- Facility type
- Physician office
- Ownership (control type)
- Proprietary
- Lab classification
- CLIA laboratory
Source: CMS Provider of Services File, Clinical Laboratories (CLIA), as of October 16, 2026. Publisher page
Lab and contact
- CLIA number
- 21D1020718
- Lab name
- Samuel R Williams MD PA
- Address
- 5707 Calverton Street Ste 1B, Catonsville, MD 21228
- Phone
- (410) 788-2350
- Fax
- (410) 788-6859
Annual test volume the lab reported
- Waived tests
- 400
Volumes are what the lab reported to CMS on its CMS-116 application, as carried in the file.
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- Cathy Healthcare LLCCertificate of Waiver, Other21D2256508
- Catonsville PediatricsCertificate of Waiver, Physician office21D0859031
- Catonsville Pharmacy LLCCertificate of Waiver, Pharmacy21D2049633
- Catonsville Primary Care Center PACertificate for Provider-Performed Microscopy Procedures, Physician office21D0219057
- Charlestown Care CenterCertificate of Waiver, Skilled nursing or nursing facility21D0703872
- Charlestown Employee Health and Wellness CenterCertificate of Waiver, Home health agency21D0894633
- Chesapeake Digestive AssociatesCertificate of Accreditation, Physician office21D0682052
- Dermatology Partners- CatonsvilleCertificate of Registration, Physician office21D2342229
- Ehmg of MD Charlestown Medical CenterCertificate for Provider-Performed Microscopy Procedures, Physician office21D0219018
Related
Questions
What is the CLIA number for Samuel R Williams MD PA in Catonsville?
21D1020718, per the CMS Provider of Services file posted October 16, 2026.
What CLIA certificate does Samuel R Williams MD PA hold?
A Certificate of Waiver, according to the CMS file.
When does CLIA 21D1020718 expire?
The CMS file lists December 29, 2027 as the certificate expiration date; the certificate took effect December 30, 2025.