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T28.90XA ICD-10-CM Code: Corrosions of unspecified internal organs, initial encounter

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

Inpatient Payment Groups (MS-DRG)

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.

Official Registry Overview & Definition

Corrosions of unspecified internal organs, initial encounter is a billable ICD-10-CM diagnosis code (T28.90A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T28.90XA in the official ICD-10-CM tabular list.

Code First

Underlying conditions that must be sequenced before this code.

  • (T51-T65) to identify chemical and intent

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98)
  • external cause code to identify place (Y92)

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

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.

Contextual Map

Every relationship of T28.90XA 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

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • T26-T28 — Burns and corrosions confined to eye and internal organs [Hierarchy]

Clinical classification (CCSR)

  • INJ019 — Burn and corrosion, initial encounter [CCSR]

Potential MS-DRG

  • DRG 935 — NON-EXTENSIVE BURNS [MS-DRG]: “NON-EXTENSIVE BURNS (MDC 22)”

MDC crossing · procedures (377)

  • MDC 22 — Burns [MDC crossing]: “Burns — 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.”
  • 0HR0X72 — Replacement of Scalp Skin with Autologous Tissue Substitute, Cell Suspension Technique, External Approach [Same-MDC procedure]: “Replacement of Scalp Skin with Autologous Tissue Substitute, Cell Suspension Technique, External Approach — grouped in MDC 22, the procedure side of this code's crossing.” · check together
  • 0HR0X73 — Replacement of Scalp Skin with Autologous Tissue Substitute, Full Thickness, External Approach [Same-MDC procedure]: “Replacement of Scalp Skin with Autologous Tissue Substitute, Full Thickness, External Approach — grouped in MDC 22, the procedure side of this code's crossing.” · check together
  • 0HR0X74 — Replacement of Scalp Skin with Autologous Tissue Substitute, Partial Thickness, External Approach [Same-MDC procedure]: “Replacement of Scalp Skin with Autologous Tissue Substitute, Partial Thickness, External Approach — grouped in MDC 22, the procedure side of this code's crossing.” · check together
  • 0HR0XJ3 — Replacement of Scalp Skin with Synthetic Substitute, Full Thickness, External Approach [Same-MDC procedure]: “Replacement of Scalp Skin with Synthetic Substitute, Full Thickness, External Approach — grouped in MDC 22, the procedure side of this code's crossing.” · check together
  • 0HR0XJ4 — Replacement of Scalp Skin with Synthetic Substitute, Partial Thickness, External Approach [Same-MDC procedure]: “Replacement of Scalp Skin with Synthetic Substitute, Partial Thickness, External Approach — grouped in MDC 22, the procedure side of this code's crossing.” · check together
  • and 372 more

Nearest codes (40)

  • T28 — Burn and corrosion of other internal organs [Sibling]
  • T28.49XA — Burn of other internal organ, initial encounter [Sibling]
  • T28.49XD — Burn of other internal organ, subsequent encounter [Sibling]
  • T28.49XS — Burn of other internal organ, sequela [Sibling]
  • T28.5 — Corrosion of mouth and pharynx [Sibling]
  • T28.5XXA — Corrosion of mouth and pharynx, initial encounter [Sibling]
  • T28.5XXD — Corrosion of mouth and pharynx, subsequent encounter [Sibling]
  • T28.5XXS — Corrosion of mouth and pharynx, sequela [Sibling]
  • and 32 more

Relationships & Classification

Clinical classification (AHRQ CCSR):INJ019 — Burn and corrosion, 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.

Potential MS-DRG Relationships (FY2026)

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

Named in the grouper logic of 1 MS-DRG: DRG 935 (MDC 22).

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

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T28.90XA require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T28.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T28.90XA in its code family, with their registry titles.

  • T28.8XXA — Corrosion of internal genitourinary organs, initial encounter
  • T28.8XXD — Corrosion of internal genitourinary organs, subsequent encounter
  • T28.8XXS — Corrosion of internal genitourinary organs, sequela
  • T28.9 — Corrosions of other and unspecified internal organs
  • T28.90 — Corrosions of unspecified internal organs
  • T28.90XD — Corrosions of unspecified internal organs, subsequent encounter
  • T28.90XS — Corrosions of unspecified internal organs, sequela
  • T28.91 — Corrosions of ear drum
  • T28.911 — Corrosions of right ear drum
  • T28.911A — Corrosions of right ear drum, initial encounter

View all codes in the T28 family