S52.121K — Displaced fracture of head of right radius, subsequent encounter for closed fracture with nonunion

BillableCC

Is S52.121K billable?

Yes — S52.121K is billable for FY2027. S52.121K is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S52.121K may be submitted for encounters from October 1, 2026 through September 30, 2027.

S52.121K at a glance

Code	S52.121K
Description	Displaced fracture of head of right radius, subsequent encounter for closed fracture with nonunion
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027
7th character "K"	subsequent encounter for closed fracture with nonunion

What does the 7th character "K" mean in S52.121K?

In S52.121K, the 7th character K means subsequent encounter for closed fracture with nonunion. The 7th character is required for S52.121K to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does S52.121K group to?

S52.121K sits in MDC 08 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

564Other Musculoskeletal System and Connective Tissue Diagnoses with MCCmedical
565Other Musculoskeletal System and Connective Tissue Diagnoses with CCmedical
566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCCmedical

As a secondary diagnosis, S52.121K is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is S52.121K listed in the Alphabetic Index?

The Alphabetic Index lists these routes under S52.12, the nearest indexed parent of S52.121K. Use them to find the family, then select the specific code.

Fracture, traumatic › radius › upper end › head (abduction) (adduction) (separation)
Fracture, traumatic › radius › upper end › head › nondisplaced (abduction) (adduction) (separation)

Excludes1 — never code together — inherited from S52

The conditions below can never be reported together with S52.121K on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

traumatic amputation of forearm (S58.-)

Use additional code — inherited from Chapter 19

Report an additional code alongside S52.121K to fully describe the condition. S52.121K is sequenced first.

code to identify any retained foreign body, if applicable (Z18.-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of S52.121K, but a patient may have both at the same time. When documentation supports it, S52.121K and the excluded code may both be reported.

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from S50-S59

The conditions below are not part of S52.121K, but a patient may have both at the same time. When documentation supports it, S52.121K and the excluded code may both be reported.

burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of wrist and hand (S60-S69)
insect bite or sting, venomous (T63.4)

Excludes2 — not included here — inherited from S52

The conditions below are not part of S52.121K, but a patient may have both at the same time. When documentation supports it, S52.121K and the excluded code may both be reported.

fracture at wrist and hand level (S62.-)
periprosthetic fracture around internal prosthetic elbow joint (M97.4)

Excludes2 — not included here — inherited from S52.1

The conditions below are not part of S52.121K, but a patient may have both at the same time. When documentation supports it, S52.121K and the excluded code may both be reported.

physeal fractures of upper end of radius (S59.2-)
fracture of shaft of radius (S52.3-)

How long has S52.121K existed?

S52.121K has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.