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ICD-10-CM 2027 diagnosis code

G90.511Complex regional pain syndrome I of right upper limb

✓ Billable / specificCC — complication/comorbidity

G90.511 is a valid, billable ICD-10-CM code for complex regional pain syndrome i of right upper limb. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G90.511

G90.511 is the ICD-10-CM diagnosis code for complex regional pain syndrome I of right upper limb. It belongs to category G90 (disorders of autonomic nervous system), block G89-G99 (other disorders of the nervous system) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within G90.51 (complex regional pain syndrome I of upper limb), G90.511 is specifically for complex regional pain syndrome I of right upper limb. Related codes cover left upper limb (G90.512), bilateral (G90.513) and unspecified upper limb (G90.519).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 337.21 (reflex sympathetic dystrophy of the upper limb).

Notes that apply from higher levels

Instructions written at a parent level also apply to G90.511.

› From G90.5 Complex regional pain syndrome I (CRPS I)
Excludes1
  • causalgia of lower limb (G57.7-)
  • causalgia of upper limb (G56.4-)
  • complex regional pain syndrome II of lower limb (G57.7-)
  • complex regional pain syndrome II of upper limb (G56.4-)
› From G90 Disorders of autonomic nervous system
Excludes1
  • dysfunction of the autonomic nervous system due to alcohol (G31.2)

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 337.21Reflex sympathetic dystrophy of the upper limbapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G90.511

Is G90.511 billable?

Yes. G90.511 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G90.511 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G90.511 as a principal diagnosis.

Is G90.511 a CC or MCC?

G90.511 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does G90.511 group to?

G90.511 is used in the MS-DRG v44.0 logic for MS-DRG 073 (Cranial and Peripheral Nerve Disorders with MCC) and MS-DRG 074 (Cranial and Peripheral Nerve Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for G90.511?

The CMS General Equivalence Mappings map G90.511 to ICD-9-CM 337.21.