CLIA lab
CLIA 21D1037930: David W Kossoff MD PA DBA Optimal Digestive Care
Frederick, MD. Certificate and address details from the CMS Provider of Services file for clinical laboratories.
CLIA number 21D1037930 belongs to David W Kossoff MD PA DBA Optimal Digestive Care in Frederick, MD.
Certificate of Waiver, effective March 8, 2025, expires March 7, 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
- March 8, 2025
- Certificate expiration
- March 7, 2027
- Status in the CMS file
- Active (termination code 00)
- Original participation date
- March 8, 2005
- 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
- 21D1037930
- Lab name
- David W Kossoff MD PA DBA Optimal Digestive Care
- Address
- 110 Thomas Johnson Dr Ste 335, Frederick, MD 21702
- Phone
- (301) 624-5566
- Fax
- (301) 624-5542
Annual test volume the lab reported
- Waived tests
- 1,500
Volumes are what the lab reported to CMS on its CMS-116 application, as carried in the file.
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Related
Questions
What is the CLIA number for David W Kossoff MD PA DBA Optimal Digestive Care in Frederick?
21D1037930, per the CMS Provider of Services file posted October 16, 2026.
What CLIA certificate does David W Kossoff MD PA DBA Optimal Digestive Care hold?
A Certificate of Waiver, according to the CMS file.
When does CLIA 21D1037930 expire?
The CMS file lists March 7, 2027 as the certificate expiration date; the certificate took effect March 8, 2025.