Local CodeSystem representing the 6 tissue/cell source options used in NPCR Anmälan form (variable D_Vavn). The numeric codes (1-6) correspond directly to the values stored in the NPCR database as defined in variabelbeskrivning_npcr.

This CodeSystem is introduced to provide complete terminological coverage of NPCR's diagnosis method options, including cases where no KVÅ activity code is defined (Cystoprostatektomi, Adenomenukleation, Annat från metastas).

Source: variabelbeskrivning_npcr (D_Vavn variable definition).

Relationship to KVÅ codes (urn:oid:1.2.752.116.1.3.2.1.4):

• Code 1 (Mellannålsbiopsi prostata) maps to KVÅ KEB00, TKE10, or TKE20 (many-to-one)
• Code 2 (TUR-P) maps to KVÅ KED22
• Code 3 (Finnålsaspirat prostata) maps to KVÅ TKE05
• Codes 4, 5, 6 have no corresponding KVÅ codes in the NPCR info specification

Design rationale: numeric codes are used to maintain direct correspondence with the NPCR database storage format (Variabelbeskrivning). Since D_Vavn has no standardized representation at the NKRR interface level (the interface uses KVÅ codes which only cover 3 of 6 options), the database-level numeric codes serve as the most stable identifier for the full set of D_Vavn options.

Usage: this CodeSystem is used alongside KVÅ in the NPCRDiagnosisMethodProcedure profile, where both the NPCR tissue source (this CodeSystem) and the KVÅ activity code (when available) can be represented as parallel codings.