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S20.374 ICD-10-CM Code: Other superficial bite of middle front wall of thorax

Compare with another code for S20.374Check this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

7th character
Required — see the character table on this page
Tabular directives
3 inclusion terms · 1 Excludes1 · 11 Excludes2

Not billable · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

7th character:required: report a code with a 7th character· The appropriate 7th character is to be added to each code from category S20See the 7th character note

Excludes1from S20.37Not reported with this code unless documented as unrelated
  • open bite of front wall of thorax (S21.14)
Excludes2from S20-S29Not included here; may be reported together
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)

+7 more in Instructions

Includesfrom S20-S29What S20-S29 covers
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

Where it sits Source: CMS/NCHS

Under:Chapter 19: Injury, Poisoning and Certain Other Consequences of External CausesS20-S29 Injuries to the thoraxS20 Superficial injury of thoraxS20.3 Other and unspecified superficial injuries of front wall of thoraxS20.37 Other superficial bite of front wall of thorax

Codes under S20.374 (3)

  • S20.374AOther superficial bite of middle front wall of thorax, initial encounterBillable
  • S20.374DOther superficial bite of middle front wall of thorax, subsequent encounterBillable
  • S20.374SOther superficial bite of middle front wall of thorax, sequelaBillable

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S20.374 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on S20.374 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

Source: inherited from S20-S29

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from S20.37

Excludes2 — Not Included Here

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

Source: inherited from S20-S29

7th Character Guide

"The appropriate 7th character is to be added to each code from category S20"

  • A — initial encounter
  • 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

S20.374A, S20.374D, S20.374S

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 S20.374

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

Before you code S20.374

  1. S20.374 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewS20.374A, S20.374D, S20.374S

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. S20.374 is not valid without one. “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. 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 →

  4. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with the code beneath S20.374. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath S20.374?
    Yes → Select that code and continue the checks below on its own page.
    No → S20.374 cannot be reported as written. Where the codes beneath it include an unspecified code, that code applies when the record goes no further; otherwise query for the missing detail.

    ReviewS20.374A, S20.374D, S20.374S

  2. Does the documentation support a condition named in S20.374’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewS21.14

  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.

Report the code beneath S20.374 that the documentation supports, not S20.374 itself. Then confirm that code is valid for the date of service on its own page.

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.
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 code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting S20.374(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with S20.374: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareS21.14

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

  • Excludes2 — not part of S20.374(11 notes)

    Coding workflow: The conditions named in this note are not included in S20.374. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareT17.5, T18.1, T17.8, T17.4, 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: Both the condition S20.374 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewS21.14

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).

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.

Don’t confuse S20.374 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of S20.374 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • S21.14— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of open bite of front wall of thorax moves the case to S21.14; the two are not reported together unless documented as unrelated.

    Full comparison: S20.374 vs S21.14 →

  • S20.379— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Other superficial bite of unspecified front wall of thorax” takes S20.379; specificity in the record moves it back here.

    Full comparison: S20.374 vs S20.379 →

  • S20.374A— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a initial encounter moves the case to S20.374A.

    Full comparison: S20.374 vs S20.374A →

  • S20.374D— Encounter relationship (Review)

    Same underlying diagnosis, different encounter phase.

    The same diagnosis at a different phase of care; one encounter takes one 7th character.

    What moves you there: Documentation of a subsequent encounter moves the case to S20.374D.

    Full comparison: S20.374 vs S20.374D →

  • T20— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of burns and corrosions adds T20; it is not part of this code and both may be reported when both are documented.

    Full comparison: S20.374 vs T20 →

  • T32— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of burns and corrosions adds T32; it is not part of this code and both may be reported when both are documented.

    Full comparison: S20.374 vs T32 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Other superficial bite of middle front wall of thorax is a non-billable ICD-10-CM category code (S20.374). A more specific billable subcode must be selected for claims submission.

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

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. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  3. 11 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

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

Related Codes

Same Index main term, other category

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

S10.87 — Other superficial bite of other specified part of neck (thyroid, superficial NEC), S10.96 — Insect bite of unspecified part of neck (neck, superficial NEC, insect), S10.97 — Other superficial bite of unspecified part of neck (neck, superficial NEC), S11.015 — Open bite of larynx (larynx), S11.025 — Open bite of trachea (trachea), S11.035 — Open bite of vocal cord (vocal cords), S11.15 — Open bite of thyroid gland (thyroid), S11.25 — Open bite of pharynx and cervical esophagus (pharynx), S11.85 — Open bite of other specified part of neck (neck, throat), S11.95 — Open bite of unspecified part of neck (neck), S21.05 — Open bite of breast (breast), S21.15 — Open bite of front wall of thorax without penetration into thoracic cavity (thorax, thoracic, front), S21.25 — Open bite of back wall of thorax without penetration into thoracic cavity (thorax, thoracic, back), S21.35 — Open bite of front wall of thorax with penetration into thoracic cavity (thorax, thoracic, front, with penetration into thoracic cavity), S21.45 — Open bite of back wall of thorax with penetration into thoracic cavity (thorax, thoracic, back, with penetration into thoracic cavity), S21.95 — Open bite of unspecified part of thorax (thorax, thoracic), S30.860 — Insect bite (nonvenomous) of lower back and pelvis (pelvis, superficial NEC, insect), S30.861 — Insect bite (nonvenomous) of abdominal wall (abdomen, abdominal, wall, superficial NEC, insect), S30.862 — Insect bite (nonvenomous) of penis (penis, superficial NEC, insect), S30.863 — Insect bite (nonvenomous) of scrotum and testes (testis, superficial NEC, insect), +133 more

Contextual Map

Every relationship of S20.374 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

Nearest codes (40)

Change history

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Common coding questions

MedCoder editorial

Can S20.374 be billed directly?

No. S20.374 (Other superficial bite of middle front wall of thorax) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does S20.374 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category S20.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "S20.374 — Other superficial bite of middle front wall of thorax." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/s20.374-other-superficial-bite-of-middle-front-wall-of-thorax

Change history

  • FY2021 — October 1, 2020
    Added to the code set
    Other superficial bite of middle front wall of thorax
    FY2021 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S20.374 in its code family, with their registry titles.

View all codes in the S20 family