S56.414A Strain of extensor muscle, fascia and tendon of left middle finger at forearm level, initial encounter

ICD-10-CM Code S56.414A: Strain of extensor muscle, fascia and tendon of left middle finger at forearm level, initial encounter

ICD-10-CM code S56.414A identifies an initial encounter for a strain affecting the extensor muscle, fascia, and tendon of the left middle finger at the forearm level. Public sources establish this specific diagnosis label and its placement within upper extremity injury categories. The available excerpts do not provide clinical treatment guidelines or payer coverage rules for this condition. 5 1

Plain-language overview

Code S56.414A corresponds to the diagnosis label strain of extensor muscle, fascia and tendon of left middle finger at forearm level, initial encounter. This describes an injury to the left middle finger's extensor structures located in the forearm during the initial encounter. 5

What this code represents

The National Health Statistics Reports place left middle finger extensor injuries at the forearm level within the upper extremity category. This classification encompasses other specified injuries to muscles, fascia, and tendons of the forearm and elbow. 1

Coding details

The official code S56.414A includes the seventh character A, which designates the initial encounter for this left middle finger extensor strain. The Centers for Medicare & Medicaid Services list this exact diagnosis code in billing and coding articles for tendon injections and home health physical therapy. 5 3 4

Documentation considerations

The available source establishes the exact clinical label for S56.414A as strain of extensor muscle, fascia and tendon of left middle finger at forearm level, initial encounter. The provided excerpts do not specify the individual documentation elements needed to support this code. 5

What the sources add

The National Library of Medicine source explains that HCPCS Level II codes are additional codes maintained by the Centers for Medicare & Medicaid Services. This source does not link HCPCS codes directly to the S56.414A diagnosis concept. 2

The National Cancer Institute EVS Explore source provides the official display label for S56.414A, while the Centers for Medicare & Medicaid Services articles list the code within service-specific billing contexts. These sources establish the code's identity and its appearance in administrative documents. 5 3 4

Coverage and utilization context

The Centers for Medicare & Medicaid Services includes S56.414A in billing and coding articles for physical therapy and tendon injection services. These listings do not imply that this diagnosis code guarantees payer coverage for any specific service. 3 4

Sources

1. National Health Statistics Reports — cdc.gov; accessed 2026-07-25.
2. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Physical Therapy - Home Health (A57311) — cms.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Injections - Tendon, Ligament, Ganglion Cyst, Tunnel Syndromes and Morton's Neuroma (A57201) — cms.gov; accessed 2026-07-25.
5. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.