F70 vs F79
F79 — Unspecified mental retardation
Distinguish a confidently graded F70 presentation from a genuinely under-documented one that should be coded F79, reinforcing that F79 is reserved for real information gaps rather than used as a shortcut when a vignette takes more effort to work through.
This is just for your own thinking. It is never submitted, sent, or stored anywhere — it disappears the moment you leave or reload this page.
Show overlap — what both share
Both describe a real, present intellectual disability with onset during the developmental period; the question is whether the available evidence supports grading it as mild or requires leaving it unspecified.
Show decisive evidence
- F70 requires clear, matching evidence of both an approximate mild-range intellectual-functioning score and a concurrent adaptive-functioning deficit, from independent sources where possible.
- F79 applies when intellectual disability is evident but the information actually available is genuinely insufficient to grade its severity, with no specific confounding impairment identified.
- A vignette that already documents both criteria clearly should not be coded F79 simply because grading takes a careful read.
- A vignette that documents intellectual disability is present, but provides no usable severity information (no test data, no detailed adaptive-functioning description), should be coded F79 rather than assumed to be mild by default.
What weakens F70: Clear, independently corroborated evidence for both F70 criteria favours F70; a genuine absence of gradable information, with no specific confound present, favours F79 instead of a default assumption of mild severity.
Show duration / course
Not duration-based; the decisive factor is whether the available evidence is sufficient to grade severity.
Show exclusions / context
F79 should not be used as a default for a genuinely gradable case that is simply detailed or effortful to work through; nor should F70 be assumed as a 'safe' default grade when severity information is genuinely missing.
Show information still needed
Whether the vignette actually contains gradable intellectual- and adaptive-functioning evidence, read carefully, before concluding severity cannot be specified.
Show the common trap
Defaulting to F70 as the 'mildest, safest' grade when severity information is genuinely missing, rather than correctly coding the case as F79.
Mini challenge — practise this distinction
Apply the discriminating evidence above to a fresh case before checking the full feedback.