2027 ICD-10-CM Diagnosis Code G89.21Chronic pain due to trauma

ICD-10-CM Codes›G00–G99›G89-G99›G89

ICD-10-CM G89.21
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G89.21 is a billable ICD-10-CM diagnosis code for chronic pain due to trauma. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. Coders also document this condition as chronic pain due to injury. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system pain and pain syndromes.

Code Identity

ICD-10-CM Code
G89.21
Billable Status
Yes — Valid for Submission
Code Describes
Chronic pain due to trauma
Short Description
Chronic pain due to trauma
Same as the full description in the CMS dataset.
Parent Code
G89.2
Chronic pain, not elsewhere classified

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG89Pain, not elsewhere classified
This CodeG89.21Chronic pain due to trauma

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic pain due to injury
  • Chronic pain following burn injury
  • Chronic pain following musculoskeletal injury
  • Chronic pain following trauma
  • Chronic pain following whiplash injury to neck
  • Pain provoked by trauma

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G89.21: its own notes plus those printed at G89.2, G89, and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From G89.2 Chronic pain, not elsewhere classified applies to 4 codes
  • causalgia, lower limb (G57.7-)
  • causalgia, upper limb (G56.4-)
  • central pain syndrome (G89.0)
  • chronic pain syndrome (G89.4)
  • complex regional pain syndrome II, lower limb (G57.7-)
  • complex regional pain syndrome II, upper limb (G56.4-)
  • neoplasm related chronic pain (G89.3)
  • reflex sympathetic dystrophy (G90.5-)
From G89 Pain, not elsewhere classified applies to 10 codes
  • generalized pain NOS (R52)
  • pain disorders exclusively related to psychological factors (F45.41)
  • pain NOS (R52)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From G89 Pain, not elsewhere classified applies to 10 codes
From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From G89 Pain, not elsewhere classified applies to 10 codes
  • related psychological factors associated with pain (F45.42)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G89.21, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming G89.21: they are not reported together with it, unless the two conditions are unrelated.

  • R52 Pain, unspecified
    acute and chronic pain, not elsewhere classified (G89.-) names G89.-, which includes this code

Code Also 1

These codes say G89.21 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • F45.42 Pain disorder with related psychological factors
    associated acute or chronic pain (G89.-) names G89.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS019
Nervous system pain and pain syndromes
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Chronic Pain

    aching sensation that persists for more than a few months. it may or may not be associated with trauma or disease, and may persist after the initial injury has healed. its localization, character, and timing are more vague than with acute pain.

Patient EducationClinical

Chronic Pain

Pain is a signal from your nervous system that something may be wrong. It is an unpleasant feeling, such as a prick, tingle, sting, burn, or ache. Pain may be sharp or dull. You may feel pain in one area of your body or all over. Each person feels pain differently, even if the reason for the pain is the same.

The full article covers:

  • What is chronic pain?
  • What causes chronic pain?
  • What are the symptoms of chronic pain?
  • Who is more likely to get chronic pain?
  • How is chronic pain diagnosed?
  • What are the treatments for chronic pain?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G89.21 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
338.21 Chronc pain d/t trauma
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G89.21Overview

What is the ICD-10 code for chronic pain due to trauma?

The ICD-10-CM code for chronic pain due to trauma is G89.21 (sometimes written as G8921). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G89.21 (Chronic pain, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chronic pain due to trauma on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G89.21 group to?

When chronic pain due to trauma is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.

Can G89.21 be reported with a code from G57.7?

Not as a rule. The Excludes1 note at G89.2, which applies to G89.21, lists "causalgia, lower limb (G57.7-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of G89.21?

Under the General Equivalence Mappings, chronic pain due to trauma converts to ICD-9-CM 338.21 (chronc pain d/t trauma). The mapping is a direct match.