Mark Rubenstein, M.d., P.a.

Mark Rubenstein, M.D., P.A., doing business as Rubenstein Mark MD, is a for-profit medical practice based in Jupiter, Florida, that provides expert witness testimony and medical consulting services to the Department of Justice as a prime contractor on full-and-open purchase orders, with no subcontract activity and no SBA set-asides across its federal footprint.

The vendor operates as a physician-owned sole proprietorship delivering expert witness services, medical record reviews, prescription legitimacy and medical necessity evaluation, and expert testimony preparation in support of federal drug enforcement investigations and prosecutions. Work is performed entirely in Jupiter, Florida on labor-hours and time-and-materials purchase orders with no set-aside designations. Recent representative prime awards include a $53 thousand expert witness services purchase order from a DOJ Offices Boards and Divisions office (awarded September 30, 2026, ultimate completion September 29, 2027); a $78 thousand subject matter expert consulting order from the Drug Enforcement Administration (awarded May 28, 2025, running through May 27, 2026); and a $53 thousand expert witness services contract from the DOJ Criminal Division (awarded October 2, 2025, running through October 1, 2027).

Customer concentration is extreme. The Drug Enforcement Administration accounts for 51 of 57 total awards (89% of award count) and $852 thousand of the $1 million combined potential value across all work (85% of dollars). The remaining three customer entities within DOJ — the Criminal Division, US Attorney's Offices, and a general DOJ Offices Boards and Divisions office — collectively represent six awards totaling $170 thousand. Across all sources, the vendor serves four distinct federal entities, all housed within the Department of Justice. The source carries no parent vehicle participation; all awards are direct purchase orders issued by customer agencies.

Activity was volatile: six awards per year in 2022 and 2023, dropping to two in 2024, rebounding to seven in 2025, and returning to six in 2026. Seven awards (combined potential value $184 thousand) reach ultimate completion within the next twenty-four months and face recompete exposure. Combined dollars obligated across all work total $985 thousand, representing 96% of the $1 million combined potential value, indicating stable funding draw. The vendor has no subcontract footprint; all 57 awards are prime contracts. Category coding shows 38 awards under NAICS 621111 (Offices of Physicians except Mental Health Specialists) and all 57 awards under PSC Support–Professional: Expert Witness, confirming a narrow and specialized service line with no diversification into other professional service categories.