Is ICD-10-CM code E84 billable?

No, E84 (Cystic fibrosis) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code E84 belong to?

E84 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E84Not billable, use a more specific code below

Cystic fibrosis

In Metabolic disorders (E70-E88), chapter 4: Endocrine, Nutritional and Metabolic Diseases

5 billable codes under E84: 2 are an MCC, 3 are a CC; all map to HCC 277 (Cystic Fibrosis).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Instructional notes

Includes: conditions that are coded here

mucoviscidosis

Code also: add a code for this too, order depends on the encounter

exocrine pancreatic insufficiency (K86.81)

Also applies, from Metabolic disorders (E70-E88)

These notes sit on E70-E88 and apply to every code under it, including E84.

Excludes1: not coded here, use a different code

androgen insensitivity syndrome (E34.5-)
congenital adrenal hyperplasia (E25.0)
hemolytic anemias attributable to enzyme disorders (D55.-)
Marfan syndrome (Q87.4-)
5-alpha-reductase deficiency (E29.1)

Excludes2: not included here, code separately if applicable

Ehlers-Danlos syndromes (Q79.6-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers diabetes mellitus coding, including type, insulin and drug use, pump malfunction and secondary diabetes, plus obesity and obesity class codes.

Diabetes mellitus (page 39)
Obesity (page 42)

Read Section I.C.4 (page 39)

All codes under E84

E84 can't be used on a claim. Pick a billable code below; grey headings group them.

E84 MS-DRGs

As the principal diagnosis, the billable codes under E84 group to these 10 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 640 Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC (2 of 5 codes)
DRG 641 Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC (2 of 5 codes)
DRG 177 Respiratory Infections and Inflammations with MCC (1 of 5 codes)
DRG 178 Respiratory Infections and Inflammations with CC (1 of 5 codes)
DRG 179 Respiratory Infections and Inflammations without CC/MCC (1 of 5 codes)
DRG 393 Other Digestive System Diagnoses with MCC (1 of 5 codes)
DRG 394 Other Digestive System Diagnoses with CC (1 of 5 codes)
DRG 395 Other Digestive System Diagnoses without CC/MCC (1 of 5 codes)
DRG 791 Prematurity with Major Problems (1 of 5 codes)
DRG 793 Full Term Neonate with Major Problems (1 of 5 codes)

Other codes that refer to E84

Notes on these codes point to E84.

E08 Code First: cystic fibrosis (E84.-)
J40-J4B Excludes2: cystic fibrosis (E84.-)
J93.12 Code First: cystic fibrosis (E84.-)
K86 Excludes2: fibrocystic disease of pancreas (E84.-)
Q45.3 Excludes1: fibrocystic disease of pancreas (E84.-)
Q55.3 Code First: any associated cystic fibrosis (E84.-)
Z71.87 Code Also: cystic fibrosis (E84.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Cystic Fibrosis

Cystic fibrosis (CF) is an inherited disease of the mucus and sweat glands. It affects mostly your lungs, pancreas, liver, intestines, sinuses, and sex organs. CF causes your mucus to be thick and sticky. The mucus clogs the lungs, causing breathing problems and making it easy for bacteria to grow. This can lead to repeated lung infections and lung damage.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.