MARK P DIAMOND MD PA
NPI 1891098919
Clinic/Center - Medical Specialty in Baltimore, MD
About Mark P Diamond Md Pa NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK P DIAMOND MD PA (NPI 1891098919) is a healthcare organization registered as a medical specialty in Baltimore, Maryland and active in the NPI registry since December 2010. The organization lists Mark Philip Diamond, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mark P Diamond Md Pa is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Mark P Diamond MD PA, which bills Medicare for the services this clinician delivers.
Clinician (1)
Baltimore, MD 21237
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Mark P Diamond MD PA's NPI number?
The NPI number for Mark P Diamond MD PA is 1891098919. It was assigned to this organization in the NPPES registry on December 11, 2010.
Where is Mark P Diamond MD PA located?
Mark P Diamond MD PA is located at 9105 Franklin Square Dr Suite 308, Baltimore, MD 21237. The listed phone number is (410) 574-5877.
What is Mark P Diamond MD PA's specialty?
The primary specialty registered for this NPI is Clinic/Center, specializing in Medical Specialty, with taxonomy code 261QM2500X.
Is Mark P Diamond MD PA enrolled in Medicare?
Yes. Mark P Diamond MD PA is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mark P Diamond MD PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Gastroenterology) reassigns their Medicare billing to Mark P Diamond MD PA. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Mark P Diamond MD PA was last updated on December 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.
# Mark P Diamond Md Pa · NPI 1891098919
Medical Specialty organization in Baltimore, Maryland. Organization record, active in the CMS NPPES registry since December 11, 2010.
## Identity
- **NPI:** 1891098919 (Entity type: Organization)
- **Enumerated:** December 11, 2010
- **Primary specialty:** Clinic/Center - Medical Specialty · taxonomy 261QM2500X
- **Organization subpart:** No
- **Authorized official:** Mark Diamond, PRESIDENT
## Practice location
- **Address:** 9105 FRANKLIN SQUARE DR, SUITE 308, Baltimore, MD 21237-3930
- **Phone:** (410) 574-5877 · **Fax:** (410) 574-5879
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Gastroenterology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 11, 2010
- **Other identifiers:** Medicare UPIN 2789 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1891098919) · Data from the CMS NPPES public registry.