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S59.199A vs S59.199K

S59.199A (Other physeal fracture of upper end of radius, unspecified arm, initial encounter for closed fracture) compared with S59.199K (Other physeal fracture of upper end of radius, unspecified arm, subsequent encounter for fracture with nonunion), from the official CMS tabular data. S59.199A and S59.199K code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S59.199A
Initial encounter
Other physeal fracture of upper end of radius, unspecified arm, initial encounter for closed fracture
S59.199K
Subsequent encounter
Other physeal fracture of upper end of radius, unspecified arm, subsequent encounter for fracture with nonunion

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. S59.199A and S59.199K code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

S59.199AOther physeal fracture of upper end of radius, unspecified arm, initial encounter for closed fractureS59.199KOther physeal fracture of upper end of radius, unspecified arm, subsequent encounter for fracture with nonunion
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionOther physeal fracture of upper end of radius, unspecified arm, initial encounter for closed fracture is a billable ICD-10-CM diagnosis code (S59.199A).Other physeal fracture of upper end of radius, unspecified arm, subsequent encounter for fracture with nonunion is a billable ICD-10-CM diagnosis code (S59.199K).
7th characterThe appropriate 7th character is to be added to each code from subcategories S59.0, S59.1, and S59.2The appropriate 7th character is to be added to each code from subcategories S59.0, S59.1, and S59.2

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources