There is no F42.0 and no F42.1. The OCD family starts at F42.2, and the code most outpatient behavioral health claims carry is F42.9, obsessive-compulsive disorder, unspecified. F42 on its own is a category header and cannot be submitted. Reaching for “F42.0” because it looks like the obvious first code is the single most common error on these claims — it will be rejected as invalid, not merely unspecified. Below: the full family, what hoarding and skin-picking code to, and the CPT pairings.
This page is billing and administrative reference. It describes what a code means and whether it can be submitted. It is not clinical advice and does not tell anyone what to diagnose.
Note what is missing. ICD-10-CM has no F42.0, F42.1, F42.5, F42.6 or F42.7 — the family is not contiguous, and the gaps are not placeholders for codes you have not found.
| Code | Title | Billable? |
|---|---|---|
| F42 | Obsessive-compulsive disorder (category header) | No |
| F42.2 | Mixed obsessional thoughts and acts | Yes |
| F42.3 | Hoarding disorder | Yes |
| F42.4 | Excoriation (skin-picking) disorder | Yes |
| F42.8 | Other obsessive-compulsive disorder | Yes |
| F42.9 | Obsessive-compulsive disorder, unspecified | Yes |
Two conditions that DSM-5 separated out sit inside F42 rather than anywhere else. Hoarding disorder is F42.3 and excoriation (skin-picking) disorder is F42.4. Both are billable as written. A practice treating either and coding F42.9 is being less specific than the record supports, which is the kind of thing a payer audit looks for.
ICD-10-CM explicitly separates excoriation disorder from factitial dermatitis (L98.1), a dermatological code. That is an Excludes1 — the two are never reported together.
Three exclusions matter in behavioral health, and all three are Excludes2, meaning the other condition may be coded alongside F42 when both are documented:
DSM-5-TR prints the ICD-10-CM code beside each disorder. Obsessive-compulsive disorder carries F42.9; hoarding disorder F42.3; excoriation disorder F42.4. DSM's insight specifiers — good or fair insight, poor insight, absent insight/delusional beliefs — and its tic-related specifier do not change the code. There is no more specific OCD code to move to on the basis of insight, which is why F42.9 dominates in practice rather than signalling a vague assessment.
| CPT | Service | Time |
|---|---|---|
| 90791 | Psychiatric diagnostic evaluation (no medical services) | — |
| 90832 | Individual psychotherapy | 16–37 minutes |
| 90834 | Individual psychotherapy | 38–52 minutes |
| 90837 | Individual psychotherapy | 53 minutes or more |
| 90847 | Family psychotherapy, patient present | 50 minutes typical |
| 90853 | Group psychotherapy | — |
A 50-minute session is 90834, not 90837 — 90837 begins at 53 minutes. CMS also sets a floor: psychotherapy under 16 minutes is not reported with these codes at all.
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No. F42 is a category header and will be rejected on its own. The billable OCD codes are F42.2, F42.3, F42.4, F42.8 and F42.9.
F42.9, obsessive-compulsive disorder, unspecified, is the code most outpatient claims carry. DSM-5-TR prints F42.9 beside obsessive-compulsive disorder.
No. ICD-10-CM has no F42.0 and no F42.1. The family starts at F42.2, and submitting F42.0 is rejected as an invalid code rather than treated as unspecified.
F42.3. It is billable as written and sits inside the OCD family rather than anywhere else.
No, and they code differently. Obsessive-compulsive personality disorder is F60.5, in the personality disorder family. ICD-10-CM lists it as an exclusion under F42.
Check a code with Afia — freeCodes on this page were verified against the CMS ICD-10-CM code sets for FY2026 and FY2027 (FY2027 effective 1 October 2026). Last reviewed 19 September 2026. Verify against the current official code set before submitting.