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S90.31XD ICD-10-CM Code: Contusion of right foot, subsequent encounter

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

7th character
Required — see the character table on this page
Tabular directives
5 Excludes2

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Overview

Contusion of right foot, subsequent encounter is a billable ICD-10-CM diagnosis code (S90.31XD).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for S90.31XD in the official ICD-10-CM tabular list.

Notes without a marker are published on S90.31XD itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

7th Character Guide

"The appropriate 7th character is to be added to each code from category S90"

  • A — initial encounter
  • D — subsequent encounter (this page’s code)
  • S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

S90.31XA, S90.31XD, S90.31XS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Contusion of right foot, subsequent encounter

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
  2. Laterality is coded in this family. Confirm the documented side matches the code — the opposite-side siblings are in the relationships section. See the opposite-side sibling codes
  3. 5 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

Other codes that name S90.31XD or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 11 Excludes2 notes: S80 — Superficial injury of knee and lower leg (via S90.-), S80-S89 — Injuries to the knee and lower leg (S80-S89) (via S90.-), S81 — Open wound of knee and lower leg (via S90.-), S82 — Fracture of lower leg, including ankle (via S90.-), S83 — Dislocation and sprain of joints and ligaments of knee (via S90.-), S84 — Injury of nerves at lower leg level (via S90.-), S85 — Injury of blood vessels at lower leg level (via S90.-), S86 — Injury of muscle, fascia and tendon at lower leg level (via S90.-), S87 — Crushing injury of lower leg (via S90.-), S88 — Traumatic amputation of lower leg (via S90.-), S89 — Other and unspecified injuries of lower leg (via S90.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Potential MS-DRG participation — not a DRG assignment.

Named in the grouper logic of 2 MS-DRGs: DRG 949 (MDC 23), DRG 950 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):INJ054 — Superficial injury; contusion, subsequent encounter (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

S90.30XD — Contusion of unspecified foot, subsequent encounter (unspecified)Compare S90.31XD vs S90.30XD →, S90.32XD — Contusion of left foot, subsequent encounter (left)Compare S90.31XD vs S90.32XD →

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

S90.31XA — Contusion of right foot, initial encounterCompare S90.31XD vs S90.31XA →, S90.31XS — Contusion of right foot, sequela

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Superficial injury; contusion, subsequent encounter).

+763 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Contusion”, “Black”; these codes share that main term but sit in a different category of the Tabular List.

S50.1 — Contusion of forearm (forearm), S60.00 — Contusion of unspecified finger without damage to nail (finger), S60.01 — Contusion of thumb without damage to nail (thumb), S60.02 — Contusion of index finger without damage to nail (finger, index), S60.03 — Contusion of middle finger without damage to nail (finger, middle), S60.04 — Contusion of ring finger without damage to nail (finger, ring), S60.05 — Contusion of little finger without damage to nail (finger, little), S60.10 — Contusion of unspecified finger with damage to nail (finger, with damage to nail), S60.11 — Contusion of thumb with damage to nail (thumb, with damage to nail), S60.12 — Contusion of index finger with damage to nail (finger, index, with damage to nail), S60.13 — Contusion of middle finger with damage to nail (finger, middle, with damage to nail), S60.14 — Contusion of ring finger with damage to nail (finger, ring, with damage to nail), S60.15 — Contusion of little finger with damage to nail (finger, little, with damage to nail), S60.21 — Contusion of wrist (wrist), S60.22 — Contusion of hand (palm), S70.0 — Contusion of hip (hip), S70.1 — Contusion of thigh (thigh), S80.0 — Contusion of knee (knee), S80.1 — Contusion of lower leg (leg), T14.8 — Other injury of unspecified body region, +84 more

Contextual Map

Every relationship of S90.31XD in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

Referenced by Excludes2 notes (11)

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]

Frequently Asked Questions (FAQ) & Clinical Guidance

Does S90.31XD require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S90.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S90.31XD in its code family, with their registry titles.

View all codes in the S90 family