E84.0
Cystic fibrosis with pulmonary manifestations
E84.0 (also written E840) is a billable ICD-10-CM diagnosis code for cystic fibrosis with pulmonary manifestations. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 5 codes in category E84 (Cystic fibrosis). The Alphabetic Index lists it under 1 entry. Its coding notes include a Use additional code instruction, a Code also instruction, 6 Excludes1 entries and 1 Excludes2 entry.
Use additional code
Add the listed code as a secondary code, if known.
- code to identify any infectious organism present, such as:
- Pseudomonas (B96.5)
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (6 notes)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Endocrine clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital MCC
Counts as a major complication or comorbidity (MCC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 5 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIncludes
Further defines or gives examples of the content of the category.
- mucoviscidosis
Notes
Also from chapter/block level (1 note)
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry