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S98.019A ICD-10-CM Code: Complete traumatic amputation of unspecified foot at ankle level, initial 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
4 Excludes2
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 173

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, Appendix B.

  • MS-DRG 913 — TRAUMATIC INJURY WITH MCC (MDC 21)
  • MS-DRG 914 — TRAUMATIC INJURY WITHOUT MCC (MDC 21)
  • MS-DRG 963 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC (MDC 24)
  • MS-DRG 964 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC (MDC 24)
  • MS-DRG 965 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC (MDC 24)

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.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 405 — Traumatic Amputations and Complications (supersedes HCC 409)

Other models: CMS-HCC V22 HCC 173

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S98.019A in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on S98.019A 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.

Source: inherited from S90-S99

7th Character Guide

"The appropriate 7th character is to be added to each code from category S98"

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

S98.019A, S98.019D, S98.019S

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.

Coder workflow for S98.019A

MedCoder structured workflow — derived from this code’s own official record

Before you code S98.019A

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, S98.019A may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    ReviewS98.011A, S98.012A

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. This page’s code carries “A”. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

    See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

  3. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: unspecified). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    ReviewS98.011A · right, S98.012A · left

    Guide: Laterality coding →

  4. Confirm the injury type, the anatomical site at the most specific level documented, laterality where the family codes it, and the encounter for the 7th character. Each injury is coded separately unless the classification provides a combination code, and a superficial injury is not coded when a more severe injury of the same site is documented. Injury chapter guidelines (Guidelines I.C.19.b, I.C.19.b.1).

    Guide: 7th characters: initial, subsequent, sequela →

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — S98.019A is appropriate when the documentation goes no further.

    ReviewS98.011A, S98.012A

  2. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

    ReviewS98.011A · right, S98.012A · left

  3. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
    Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
    No → The code is invalid without its 7th character — query for the missing element.

Consider S98.019A. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Anatomical site
At the most specific level the record states; a site the classification separates cannot be assumed from a procedure or a measurement.
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
Encounter type
Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).
External cause, place and activity
For the external cause codes reported with the injury or poisoning, where documented (Guidelines I.C.20.a).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes2 — not part of S98.019A(4 notes)

    Coding workflow: The conditions named in this note are not included in S98.019A. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareS82, T63.4

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the specific siblings in this subcategory and what each requires the record to state.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

ReviewS98.011A, S98.012A

Documentation: The patient returns during the healing or recovery phase after active treatment of the same condition.

Coding question: Which 7th character applies?

Path: Review the official 7th-character definitions for this family in the 7th Character Guide.

Reason: “Initial encounter” means active treatment, not the first visit; care during recovery takes “subsequent encounter”, and a complication arising from the original condition takes “sequela” (Guidelines I.C.19.a).

Documentation: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

ReviewS98.011A · right, S98.012A · left

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Complete traumatic amputation of unspecified foot at ankle level, initial encounter is a billable ICD-10-CM diagnosis code (S98.019A).

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

Verify Before Coding

  • CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name S98.019A 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 2 Excludes1 notes: S88 — Traumatic amputation of lower leg (via S98.-), S91 — Open wound of ankle, foot and toes (via S98.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 12 Excludes2 notes: S80 — Superficial injury of knee and lower leg (via S98.-), S80-S89 — Injuries to the knee and lower leg (S80-S89) (via S98.-), S81 — Open wound of knee and lower leg (via S98.-), S82 — Fracture of lower leg, including ankle (via S98.-), S83 — Dislocation and sprain of joints and ligaments of knee (via S98.-), S84 — Injury of nerves at lower leg level (via S98.-), S85 — Injury of blood vessels at lower leg level (via S98.-), S86 — Injury of muscle, fascia and tendon at lower leg level (via S98.-), S87 — Crushing injury of lower leg (via S98.-), S88 — Traumatic amputation of lower leg (via S98.-), S89 — Other and unspecified injuries of lower leg (via S98.-), S92 — Fracture of foot and toe, except ankle (via S98.-).

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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 330 clinically related codes on its CMS exclusion list. Does not count toward severity when the stay groups to DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).

Named in the grouper logic of 5 MS-DRGs: DRG 913 (MDC 21), DRG 914 (MDC 21), DRG 963 (MDC 24), DRG 964 (MDC 24), DRG 965 (MDC 24).

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

Clinical classification (AHRQ CCSR):INJ014 — Amputation of a limb, initial 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.

S98.011A — Complete traumatic amputation of right foot at ankle level, initial encounter (right)Compare S98.019A vs S98.011A →, S98.012A — Complete traumatic amputation of left foot at ankle level, initial encounter (left)Compare S98.019A vs S98.012A →

Same injury, other encounter phase

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

S98.019D — Complete traumatic amputation of unspecified foot at ankle level, subsequent encounterCompare S98.019A vs S98.019D →, S98.019S — Complete traumatic amputation of unspecified foot at ankle level, sequelaCompare S98.019A vs S98.019S →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Traumatic Amputations and Complications) for risk-adjusted payment.

S88.122A — Partial traumatic amputation at level between knee and ankle, left lower leg, initial encounter, S88.129A — Partial traumatic amputation at level between knee and ankle, unspecified lower leg, initial encounter, S88.911A — Complete traumatic amputation of right lower leg, level unspecified, initial encounter, S88.912A — Complete traumatic amputation of left lower leg, level unspecified, initial encounter, S88.919A — Complete traumatic amputation of unspecified lower leg, level unspecified, initial encounter, S88.921A — Partial traumatic amputation of right lower leg, level unspecified, initial encounter, S88.922A — Partial traumatic amputation of left lower leg, level unspecified, initial encounter, S88.929A — Partial traumatic amputation of unspecified lower leg, level unspecified, initial encounter, S98.011A — Complete traumatic amputation of right foot at ankle level, initial encounter, S98.012A — Complete traumatic amputation of left foot at ankle level, initial encounter, S98.021A — Partial traumatic amputation of right foot at ankle level, initial encounter, S98.022A — Partial traumatic amputation of left foot at ankle level, initial encounter, S98.029A — Partial traumatic amputation of unspecified foot at ankle level, initial encounter, S98.311A — Complete traumatic amputation of right midfoot, initial encounter, S98.312A — Complete traumatic amputation of left midfoot, initial encounter, S98.319A — Complete traumatic amputation of unspecified midfoot, initial encounter, S98.321A — Partial traumatic amputation of right midfoot, initial encounter, S98.322A — Partial traumatic amputation of left midfoot, initial encounter, S98.329A — Partial traumatic amputation of unspecified midfoot, initial encounter, S98.911A — Complete traumatic amputation of right foot, level unspecified, initial encounter, +87 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Amputation Status, Lower Limb/Amputation Complications

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Amputation of a limb, initial encounter).

S88.122A — Partial traumatic amputation at level between knee and ankle, left lower leg, initial encounter, S88.129A — Partial traumatic amputation at level between knee and ankle, unspecified lower leg, initial encounter, S88.911A — Complete traumatic amputation of right lower leg, level unspecified, initial encounter, S88.912A — Complete traumatic amputation of left lower leg, level unspecified, initial encounter, S88.919A — Complete traumatic amputation of unspecified lower leg, level unspecified, initial encounter, S88.921A — Partial traumatic amputation of right lower leg, level unspecified, initial encounter, S88.922A — Partial traumatic amputation of left lower leg, level unspecified, initial encounter, S88.929A — Partial traumatic amputation of unspecified lower leg, level unspecified, initial encounter, S98.011A — Complete traumatic amputation of right foot at ankle level, initial encounter, S98.012A — Complete traumatic amputation of left foot at ankle level, initial encounter, S98.021A — Partial traumatic amputation of right foot at ankle level, initial encounter, S98.022A — Partial traumatic amputation of left foot at ankle level, initial encounter, S98.029A — Partial traumatic amputation of unspecified foot at ankle level, initial encounter, S98.111A — Complete traumatic amputation of right great toe, initial encounter, S98.112A — Complete traumatic amputation of left great toe, initial encounter, S98.119A — Complete traumatic amputation of unspecified great toe, initial encounter, S98.121A — Partial traumatic amputation of right great toe, initial encounter, S98.122A — Partial traumatic amputation of left great toe, initial encounter, S98.129A — Partial traumatic amputation of unspecified great toe, initial encounter, S98.131A — Complete traumatic amputation of one right lesser toe, initial encounter, +151 more

Same Index main term, other category

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

S68.42 — Partial traumatic amputation of hand at wrist level (traumatic, hand, partial), S68.51 — Complete traumatic transphalangeal amputation of thumb (traumatic, thumb, transphalangeal), S68.52 — Partial traumatic transphalangeal amputation of thumb (traumatic, thumb, transphalangeal, partial), S68.61 — Complete traumatic transphalangeal amputation of other and unspecified finger(s) (traumatic, finger, transphalangeal), S68.62 — Partial traumatic transphalangeal amputation of other and unspecified finger (traumatic, finger, transphalangeal, partial), S68.71 — Complete traumatic transmetacarpal amputation of hand (traumatic, hand, transmetacarpal), S68.72 — Partial traumatic transmetacarpal amputation of hand (traumatic, hand, transmetacarpal, partial), S78.01 — Complete traumatic amputation at hip joint (traumatic, hip, at hip joint), S78.02 — Partial traumatic amputation at hip joint (traumatic, hip, at hip joint, partial), S78.11 — Complete traumatic amputation at level between hip and knee (traumatic, hip, between hip and knee), S78.12 — Partial traumatic amputation at level between hip and knee (traumatic, hip, between hip and knee, partial), S78.91 — Complete traumatic amputation of hip and thigh, level unspecified (traumatic, hip), S78.92 — Partial traumatic amputation of hip and thigh, level unspecified (traumatic, hip, partial), S88.01 — Complete traumatic amputation at knee level (traumatic, leg, at knee level), S88.02 — Partial traumatic amputation at knee level (traumatic, leg, at knee level, partial), S88.11 — Complete traumatic amputation at level between knee and ankle (traumatic, leg, between knee and ankle), S88.12 — Partial traumatic amputation at level between knee and ankle (traumatic, leg, between knee and ankle, partial), S88.91 — Complete traumatic amputation of lower leg, level unspecified (traumatic, leg), S88.92 — Partial traumatic amputation of lower leg, level unspecified (traumatic, leg, partial), Z89.9 — Acquired absence of limb, unspecified (stump, healed or old NOS), +33 more

Contextual Map

Every relationship of S98.019A 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.

Run S98.019A with these 10 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes (12)

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 405 — Traumatic Amputations and Complications [CMS-HCC]: “Traumatic Amputations and Complications — supersedes HCC 409 (Amputation Status, Lower Limb/Amputation Complications)”— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs[MDC crossing]: “Injuries, Poisonings and Toxic Effects of Drugs — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 32,029 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026
  • MDC 24 — Multiple Significant Trauma[MDC crossing]: “Multiple Significant Trauma — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 22,957 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

Does S98.019A require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S98.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Complete traumatic amputation of unspecified foot at ankle level, initial 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.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S98.019A in its code family, with their registry titles.

View all codes in the S98 family