SKS procedure codes

SKS procedure codes span multiple groups: K (surgical), UX (examinations), B (treatment), N (anesthesia), W (clinical physiology), and Z (supplementary).

See the SKS overview for the full system description, code structure, and supported groups.

Filter by procedure codes

Use the is-a operator with multiple ancestor prefixes to restrict predictions to procedure codes. Because SKS uses a prefix-based hierarchy, is-a matches each prefix and all its descendants. Request: restrict predictions to SKS procedure codes (K, UX, B, Z, W, N groups) using is-a with multiple ancestors:

{
  "system": ["sks"],
  "context": [
    { "type": "text", "text": "Patient indlagt med akut hjerteinsufficiens og type 2-diabetes. Røntgen af højre knæ udført." }
  ],
  "filters": [
    {
      "systemId": "sks",
      "include": {
        "conditions": [
          { "property": "code", "op": "is-a", "value": ["K", "UX", "B", "Z", "W", "N"] }
        ]
      }
    }
  ]
}

Response: only procedure codes are returned:

{
  "codes": [
    {
      "system": "sks",
      "code": "UXRG25+TUL1",
      "display": "Røntgenundersøgelse af knæ, højre",
      "evidences": [
        {
          "contextIndex": 0,
          "text": "Røntgen af højre knæ",
          "start": 64,
          "end": 84
        }
      ]
    }
  ],
  "candidates": [],
  "usageInfo": {
    "creditsConsumed": 1.5
  }
}

The +TUL1 suffix is a lateral modifier indicating the right side. Both diagnosis and procedure codes can carry modifiers; see Lateral modifiers for the full list.

API reference → See code filtering for full details on filter properties, operators, and additional examples.

Modifiers on procedure codes

Both diagnosis and procedure codes can carry lateral modifiers (see Lateral modifiers for the full list). The official proc.lateral LPR3 code list defines which procedure codes must receive a lateral modifier; for example, UXRG25 (Røntgenundersøgelse af knæ) is in the list. Procedure codes can also carry contrast modifiers (UXZ11, UXZ12); the proc.kontrast list defines which codes must receive contrast. TUL7 (side cannot be specified) has no procedure equivalent; if the side is not documented, no laterality modifier is attached.

Code	Display	Modifier
`UXRG25+TUL1`	X-ray of the knee, right	`TUL1`: right-sided
`UXRG25+TUL2`	X-ray of the knee, left	`TUL2`: left-sided
`UXRG25+TUL1+UXZ11`	X-ray of the knee, right, without contrast	`TUL1` + `UXZ11`

TUL3 (bilateral) is not used on procedure codes. A bilateral procedure returns two separate codes: one with TUL1 (right) and one with TUL2 (left). For example, a bilateral knee X-ray appears as UXRG25+TUL1 and UXRG25+TUL2. Other modifiers (such as contrast) are preserved on both entries. On diagnosis codes, TUL3 remains a single code.

SKS overview: system description, code structure, lateral modifiers
SKS diagnosis codes: filter to diagnosis codes only

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Filter by procedure codes

Modifiers on procedure codes

​Filter by procedure codes

​Modifiers on procedure codes

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Filter by procedure codes

Modifiers on procedure codes

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