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ICD-10-CM 2027 diagnosis code

S52.201CUnspecified fracture of shaft of right ulna, initial encounter for open fracture type IIIA, IIIB, or IIIC

✓ Billable / specificRequires 7th characterMCC — major complication/comorbidity

S52.201C is a valid, billable ICD-10-CM code for unspecified fracture of shaft of right ulna, initial encounter for open fracture type iiia, iiib, or iiic. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Unsp fx shaft of right ulna, init for opn fx type 3A/B/C

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 S52.201C

S52.201C is the ICD-10-CM diagnosis code for unspecified fracture of shaft of right ulna, initial encounter for open fracture type IIIA, IIIB, or IIIC. It belongs to category S52 (fracture of forearm), block S50-S59 (injuries to the elbow and forearm) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "C" means initial encounter for open fracture type IIIA, IIIB, or IIIC: use it while the patient is receiving active treatment for the condition.

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" 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 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC, relative weight 1.398), DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC, relative weight 0.8985), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and DRG 965 (Other Multiple Significant Trauma without CC/MCC, relative weight 1.0059), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue) and MDC 24 (Multiple Significant Trauma), 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 813.32 (open fracture of shaft of ulna (alone)).

7th character

Cinitial encounter for open fracture type IIIA, IIIB, or IIIC

CC/MCC status for this injury by encounter: CC for A, K, M, N, P, Q, R; MCC for B, C; Neither CC nor MCC for D, E, F, G, H, J, S.

Other encounter types for S52.201:

Notes that apply from higher levels

Instructions written at a parent level also apply to S52.201C.

› From S52 Fracture of forearm
Note
  • A fracture not indicated as displaced or nondisplaced should be coded to displaced
  • A fracture not indicated as open or closed should be coded to closed
  • The open fracture designations are based on the Gustilo open fracture classification
Excludes1
  • traumatic amputation of forearm (S58.-)
Excludes2
  • fracture at wrist and hand level (S62.-)
  • periprosthetic fracture around internal prosthetic elbow joint (M97.4)

Broader instructions also apply from S50-S59 Injuries to the elbow and forearm and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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 →
  • 813.32Open fracture of shaft of ulna (alone)approximate

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 S52.201C

Is S52.201C billable?

Yes. S52.201C is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "C" at the end of S52.201C mean?

It is the 7th character for initial encounter for open fracture type IIIA, IIIB, or IIIC. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can S52.201C be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict S52.201C as a principal diagnosis.

Is S52.201C a CC or MCC?

S52.201C is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does S52.201C group to?

S52.201C is used in the MS-DRG v44.0 logic for MS-DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC), MS-DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and MS-DRG 965 (Other Multiple Significant Trauma without CC/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 S52.201C?

The CMS General Equivalence Mappings map S52.201C to ICD-9-CM 813.32.