SIEMENS brand COHERENCE RT Therapist versions RTT MR1 — Class II medical device recall Z-1039-2013

Terminated recall by Siemens Medical Solutions USA, Inc, reported 2013-04-10. Siemen's issued a Customer Information Letter under Update Instruction TH016/12S to alert all its affected cus

Recall number	`Z-1039-2013`
Product type	Medical device
Classification	Class II
Status	Terminated
Voluntary or mandated	Voluntary
Recalling firm	Siemens Medical Solutions USA, Inc, Martinez, CA, United States
Recall initiated	2013-03-05
Classified	2013-04-01
Reported by FDA	2013-04-10
Terminated	2014-08-28
Quantity	621 units
Reason classes	software
Model numbers	`8139839`

Product

SIEMENS brand COHERENCE RT Therapist versions RTT MR1.5, RTT 2.1/2.1A and RTT 2.2/ 2.2B; Software release for COHERENCE Therapist 2.3 for Primus and Oncor Linear Accelerators; Model: COHERENCE TH 2.0, Part No. 8139839, Current R630; Product Usage: The intended use of the SIEMENS branded ONCOR and PRIMUS family of linear accelerator systems is to deliver X-ray photon and electron radiation for the therapeutic treatment of cancer.

Reason for recall

Siemen's issued a Customer Information Letter under Update Instruction TH016/12S to alert all its affected customers of the software issues. The software release is a result of the final system testing addressing multiple performance defects and several safety issues that were not considered critical (for immediate correction) for the safe use of the device.

Machine access

This record, with every extracted code, the verbatim FDA record and provenance, is available from the recall API: GET https://api.data.aroqon.com/v1/recalls/Z-1039-2013. Look up any UPC, UDI, NDC or lot with /v1/recalls/lookup?code=…. API docs · free and paid keys.

Source: U.S. Food and Drug Administration enforcement report via openFDA (CC0). Structured by Data Foundry (recall-structuring@2); last changed 2026-09-26. Not affiliated with or endorsed by FDA. Not medical or legal advice.