ICD-10-CM Code First Notes · Chapter 5 · FY 2027 F01-F99

Code First Notes in Chapter 5: Mental and behavioural disorders ICD-10-CM

A Code First note means the underlying condition named in the note is sequenced before this code. In Chapter 5 (F01-F99), notes printed in the chapter name other codes 45 times, and Code First Notes anywhere in the Tabular List name the chapter’s codes 10 times, covering 9 distinct codes, categories and ranges. Switch views to read the list either way.

✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A
45
References in Its Notes
10
References to Its Codes
9
Chapter Codes Named
F01-F99
Chapter 5
Chapter 5

Code First Notes by the code that carries the note

5 of 5 shown
  • F02 Dementia in other diseases classified elsewhere applies to 24 codes
    • Alzheimer's (G30.-)
    • cerebral lipidosis (E75.4)
    • Creutzfeldt-Jakob disease (A81.0-)
    • epilepsy and recurrent seizures (G40.-)
    • hepatolenticular degeneration (E83.01)
    • human immunodeficiency virus [HIV] disease (B20)
    • Huntington's disease (G10)
    • hypercalcemia (E83.52)
    • hypothyroidism, acquired (E00-E03.-)
    • intoxications (T36-T65)
    • Jakob-Creutzfeldt disease (A81.0-)
    • multiple sclerosis (G35-)
    • neurocognitive disorder with Lewy bodies (G31.83)
    • neurosyphilis (A52.17)
    • niacin deficiency [pellagra] (E52)
    • other frontotemporal neurocognitive disorder (G31.09)
    • Parkinson's disease (G20.-)
    • Pick's disease (G31.01)
    • polyarteritis nodosa (M30.0)
    • prion disease (A81.9)
    • systemic lupus erythematosus (M32.-)
    • traumatic brain injury (S06.-)
    • trypanosomiasis (B56.-, B57.-)
    • vitamin B deficiency (E53.8)
  • F05 Delirium due to known physiological condition
  • F06.7 Mild neurocognitive disorder due to known physiological condition applies to 2 codes
    • Alzheimer's disease (G30.-)
    • human immunodeficiency virus [HIV] disease (B20)
    • Huntington's disease (G10)
    • Neurocognitive disorder with Lewy bodies (G31.83)
    • other frontotemporal neurocognitive disorder (G31.09)
    • Parkinson's disease (G20.-)
    • systemic lupus erythematosus (M32.-)
    • traumatic brain injury (S06.-)
    • vitamin B deficiency (E53.-)
  • F48.2 Pseudobulbar affect
    • amyotrophic lateral sclerosis (G12.21)
    • multiple sclerosis (G35-)
    • sequelae of cerebrovascular disease (I69.-)
    • sequelae of traumatic intracranial injury (S06.-)
  • F54 Psychological and behavioral factors associated with disorders or diseases classified elsewhere

The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Code First Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Code First Notes

What does a Code First note mean?

A Code First note means the underlying condition named in the note is sequenced before the code that carries the note. Under the etiology/manifestation convention, a “code first” note appears at the manifestation code and a “use additional code” note at the etiology code (Section I.A.13). The FY 2027 Tabular List has 810 of them; 600 name other codes, with 736 references to 429 distinct codes, categories and ranges.

Can a code with a Code First note be the principal diagnosis?

Not when it is a manifestation code. Codes titled “in diseases classified elsewhere” are never permitted as the first-listed or principal diagnosis; they must follow the underlying condition. The etiology and manifestation page lists them all.

Related References

ICD-10-CM Official GuidelinesICD-10-CM Code LookupICD-10-CM Codes ListCode Lists by Tag

Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.