Alphabetic Index FY2027

G89.18

Other acute postprocedural pain

FY2027Chapter 6: Diseases of the nervous system/G89–G99 Other disorders of the nervous system

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - OtherIPF Primary · MS-DRG 947–948

G89.18 (also written G8918) is a billable ICD-10-CM diagnosis code for other acute postprocedural pain. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category G89 (Pain, not elsewhere classified). The Alphabetic Index lists it under 3 entries. Its coding notes include a Code also instruction, 3 Excludes1 entries and 35 Excludes2 entries.

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

G89 is for pain specified as acute, chronic, post-thoracotomy, postprocedural or neoplasm-related. It is not assigned when the underlying diagnosis is known, unless the encounter is for pain control.

Guidelines I.C.6.b.1Pain codes in category G89Read the official text

Postoperative pain not specified as acute or chronic defaults to the acute form. Routine or expected pain right after surgery is not coded.

Guidelines I.C.6.b.3Postoperative painRead the official text

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

Inherited from G89 Pain, not elsewhere classified
  • related psychological factors associated with pain (F45.42)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from G89 Pain, not elsewhere classified
  • generalized pain NOS (R52)
  • pain disorders exclusively related to psychological factors (F45.41)
  • pain NOS (R52)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from G89 Pain, not elsewhere classified
Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

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 - Other clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

IPF Primary

IPF MS-DRG adjustment. A principal diagnosis of this code groups to one of these MS-DRGs. Which one depends on other facts of the stay, so the factor is a range:

MS-DRGDescriptionFactor
947Signs and Symptoms w MCC1.12
948Signs and Symptoms w/out MCC1.09
A principal diagnosis that groups to none of the 19 designated MS-DRGs gets no MS-DRG adjustment. Otherwise the claim still receives the federal per diem base rate and the other adjustments.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum A; code lists from the CMS MS-DRG Definitions Manual v44; effective for discharges on or after October 1, 2026

Inclusion terms

Conditions classified to this code.

This code
  • Postoperative pain NOS
  • Postprocedural pain NOS

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 3 entries