Chapter 5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

a. Pain disorders related to psychological factors

Assign code F45.41, for pain that is exclusively related to psychological disorders. As indicated by the Excludes 1 note under category G89, a code from category G89 should not be assigned with code F45.41. Code F45.42, Pain disorders with related psychological factors, should be used with a code from category G89, Pain, not elsewhere classified, if there is documentation of a psychological component for a patient with acute or chronic pain. See Section I.C.6. Pain

b. Mental and behavioral disorders due to psychoactive substance use

1) In Remission

Selection of codes for "in remission" for categories F10-F19, Mental and behavioral disorders due to psychoactive substance use (categories F10-F19 with -.21) requires the provider's clinical judgment. The appropriate codes for "in remission" are assigned only on the basis of provider documentation (as defined in the Official Guidelines for Coding and Reporting).

2) Psychoactive Substance Use, Abuse And Dependence

When the provider documentation refers to use, abuse and dependence of the same substance (e.g. alcohol, opioid, cannabis, etc.), only one code should be assigned to identify the pattern of use based on the following hierarchy:

3) Psychoactive Substance Use

As with all other diagnoses, the codes for psychoactive substance use (F10.9-, F11.9-, F12.9-, F13.9-, F14.9-, F15.9-, F16.9-) should only be assigned based on provider documentation and when they meet the definition of a reportable diagnosis (see Section III, Reporting Additional Diagnoses). The codes are to be used only when the psychoactive substance use is associated with a mental or behavioral disorder, and such a relationship is documented by the provider.

c. Factitious Disorder

Factitious disorder imposed on self or Munchausen’s syndrome is a disorder in which a person falsely reports or causes his or her own physical or psychological signs or symptoms. For patients with documented factitious disorder on self or Munchausen’s syndrome, assign the appropriate code from subcategory F68.1-, Factitious disorder imposed on self.

Munchausen’s syndrome by proxy (MSBP) is a disorder in which a caregiver (perpetrator) falsely reports or causes an illness or injury in another person (victim) under his or her care, such as a child, an elderly adult, or a person who has a disability. The condition is also referred to as “factitious disorder imposed on another” or “factitious disorder by proxy.” The perpetrator, not the victim, receives this diagnosis. Assign code F68.A, Factitious disorder imposed on another, to the perpetrator’s record. For the victim of a patient suffering from MSBP, assign the appropriate code from categories T74, Adult and child abuse, neglect and other maltreatment, confirmed, or T76, Adult and child abuse, neglect and other maltreatment, suspected.

See Section I.C.19.f. Adult and child abuse, neglect and other maltreatment