ICD10BillableValid for clinical use
ICD-10 Code E84.9: Cystic fibrosis, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).
When is it used?
- May be used when a clinician documents cystic fibrosis, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
4Endocrine, nutritional and metabolic diseases (E00-E89)
block
E70-E88Metabolic disorders
category
E84Cystic fibrosis
currentE84
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
EndocrinologistGeneral Physician
Related codes
Sibling codes
Coverage-related procedures and services
CPT 82652high
VITAMIN D; 1, 25 DIHYDROXY, INCLUDES FRACTION(S), IF PERFORMED
Source: CMS coverage guidance
CPT 82306high
VITAMIN D; 25 HYDROXY, INCLUDES FRACTION(S), IF PERFORMED
Source: CMS coverage guidance
CPT 31720high
CATHETER ASPIRATION (SEPARATE PROCEDURE); NASOTRACHEAL
Source: CMS coverage guidance
CPT 94664high
DEMONSTRATION AND/OR EVALUATION OF PATIENT UTILIZATION OF AN AEROSOL GENERATOR, NEBULIZER, METERED DOSE INHALER OR IPPB DEVICE
Source: CMS coverage guidance
CPT 94640high
PRESSURIZED OR NONPRESSURIZED INHALATION TREATMENT FOR ACUTE AIRWAY OBSTRUCTION FOR THERAPEUTIC PURPOSES AND/OR FOR DIAGNOSTIC PURPOSES SUCH AS SPUTUM INDUCTION WITH AN AEROSOL GENERATOR, NEBULIZER, METERED DOSE INHALER OR INTERMITTENT POSITIVE PRESSURE BREATHING (IPPB) DEVICE
Source: CMS coverage guidance
CPT 94642high
AEROSOL INHALATION OF PENTAMIDINE FOR PNEUMOCYSTIS CARINII PNEUMONIA TREATMENT OR PROPHYLAXIS
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 762270003high
Atypical cystic fibrosis
Source: SNOMED International ICD-10 map
SNOMED_CT 762269004high
Classical cystic fibrosis
Source: SNOMED International ICD-10 map
SNOMED_CT 190905008high
Cystic fibrosis
Source: SNOMED International ICD-10 map
SNOMED_CT 1296527009high
Cystic fibrosis due to heterozygous deltaF508 mutation
Source: SNOMED International ICD-10 map
SNOMED_CT 1296528004high
Cystic fibrosis due to homozygous deltaF508 mutation
Source: SNOMED International ICD-10 map
SNOMED_CT 235978006high
Cystic fibrosis of pancreas
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
E84.9
Common synonyms
Cystic fibrosis, unspecifiedCystic fibrosis
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.