K21.9 – Gastro-esophageal reflux disease without esophagitis

ICD-10-CM 2027 diagnosis code · Diseases of esophagus, stomach and duodenum

Billable code

ICD-10-CM code K21.9

Code: K21.9 (claims format: K219)
Description: Gastro-esophageal reflux disease without esophagitis
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K20-K31 Diseases of esophagus, stomach and duodenum
Parent codes: K21

Notes for K21.9

Applicable to:

Esophageal reflux NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K21 – Gastro-esophageal reflux disease

Excludes1 (not coded here):

newborn esophageal reflux (P78.83)

Block K20-K31

Excludes2 (not included here):

hiatus hernia (K44.-)

Index terms for K21.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K21

K21.0 – Gastro-esophageal reflux disease with esophagitisHeader

Frequently asked questions

What is ICD-10 code K21.9?

K21.9 is the ICD-10-CM code for gastro-esophageal reflux disease without esophagitis, in the block K20-K31 (Diseases of esophagus, stomach and duodenum).

Is K21.9 a billable code?

Yes. K21.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K21.9 belong to?

It belongs to category K21 – Gastro-esophageal reflux disease.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.