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S56.019A vs S56.019D

S56.019A (Strain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, initial encounter) compared with S56.019D (Strain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, subsequent encounter), from the official CMS tabular data. S56.019A and S56.019D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S56.019A
Initial encounter
Strain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, initial encounter
S56.019D
Subsequent encounter
Strain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, subsequent encounter

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. S56.019A and S56.019D 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

S56.019AStrain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, initial encounterS56.019DStrain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, subsequent encounter
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)
DefinitionStrain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, initial encounter is a billable ICD-10-CM diagnosis code (S56.019A).Strain of flexor muscle, fascia and tendon of unspecified thumb at forearm level, subsequent encounter is a billable ICD-10-CM diagnosis code (S56.019D).
7th characterThe appropriate 7th character is to be added to each code from category S56The appropriate 7th character is to be added to each code from category S56

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