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T33.3XXD ICD-10-CM Code: Superficial frostbite of abdominal wall, lower back and pelvis, 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
1 inclusion term · 1 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 v44, 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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T33.3XXD 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 T33.3XXD 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.

  • frostbite with partial thickness skin loss

Source: inherited from T33

Excludes2 — Not Included Here

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

Source: inherited from T33-T34

7th Character Guide

"The appropriate 7th character is to be added to each code from category T33"

  • 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

T33.3XXA, T33.3XXD, T33.3XXS

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 T33.3XXD

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

Before you code T33.3XXD

  1. 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 “D”. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

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

  2. 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. 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 T33.3XXD. 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.
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).

Official instructions as workflow

  • Excludes2 — not part of T33.3XXD(1 note)

    Coding workflow: The conditions named in this note are not included in T33.3XXD. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareT68, T69

    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 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 T33.3XXD with…

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

The codes most likely to be picked instead of T33.3XXD — 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.

  • T33.3XXA— 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 T33.3XXA.

    Full comparison: T33.3XXD vs T33.3XXA →

  • T33.3XXS— 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 sequela moves the case to T33.3XXS.

    Full comparison: T33.3XXD vs T33.3XXS →

  • T68— 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 hypothermia and other effects of reduced temperature adds T68; it is not part of this code and both may be reported when both are documented.

    Full comparison: T33.3XXD vs T68 →

  • T69— 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 hypothermia and other effects of reduced temperature adds T69; it is not part of this code and both may be reported when both are documented.

    Full comparison: T33.3XXD vs T69 →

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.

Code Overview

Superficial frostbite of abdominal wall, lower back and pelvis, subsequent encounter is a billable ICD-10-CM diagnosis code (T33.3XXD).

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

  • 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

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name T33.3XXD 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 1 Excludes1 note: T07 — Unspecified multiple injuries (via T33.-).

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

Referenced by 112 Excludes2 notes across 2 chapters: I73 — Other peripheral vascular diseases (via T33.-), S00 — Superficial injury of head (via T33.-), S00-S09 — Injuries to the head (S00-S09) (via T33.-), S01 — Open wound of head (via T33.-), S02 — Fracture of skull and facial bones (via T33.-), S03 — Dislocation and sprain of joints and ligaments of head (via T33.-), S04 — Injury of cranial nerve (via T33.-), S05 — Injury of eye and orbit (via T33.-), S06 — Intracranial injury (via T33.-), S07 — Crushing injury of head (via T33.-), S08 — Avulsion and traumatic amputation of part of head (via T33.-), S09 — Other and unspecified injuries of head (via T33.-), S10 — Superficial injury of neck (via T33.-), S10-S19 — Injuries to the neck (S10-S19) (via T33.-), S11 — Open wound of neck (via T33.-), S12 — Fracture of cervical vertebra and other parts of neck (via T33.-), S13 — Dislocation and sprain of joints and ligaments at neck level (via T33.-), S14 — Injury of nerves and spinal cord at neck level (via T33.-), S15 — Injury of blood vessels at neck level (via T33.-), S16 — Injury of muscle, fascia and tendon at neck level (via T33.-), +92 more.

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

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):INJ058 — Effect of other external causes, 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 injury, other encounter phase

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

T33.3XXA — Superficial frostbite of abdominal wall, lower back and pelvis, initial encounterCompare T33.3XXD vs T33.3XXA →, T33.3XXS — Superficial frostbite of abdominal wall, lower back and pelvis, sequela

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Effect of other external causes, subsequent encounter).

T33.011D — Superficial frostbite of right ear, subsequent encounter, T33.012D — Superficial frostbite of left ear, subsequent encounter, T33.019D — Superficial frostbite of unspecified ear, subsequent encounter, T33.02XD — Superficial frostbite of nose, subsequent encounter, T33.09XD — Superficial frostbite of other part of head, subsequent encounter, T33.1XXD — Superficial frostbite of neck, subsequent encounter, T33.2XXD — Superficial frostbite of thorax, subsequent encounter, T33.40XD — Superficial frostbite of unspecified arm, subsequent encounter, T33.41XD — Superficial frostbite of right arm, subsequent encounter, T33.42XD — Superficial frostbite of left arm, subsequent encounter, T33.511D — Superficial frostbite of right wrist, subsequent encounter, T33.512D — Superficial frostbite of left wrist, subsequent encounter, T33.519D — Superficial frostbite of unspecified wrist, subsequent encounter, T33.521D — Superficial frostbite of right hand, subsequent encounter, T33.522D — Superficial frostbite of left hand, subsequent encounter, T33.529D — Superficial frostbite of unspecified hand, subsequent encounter, T33.531D — Superficial frostbite of right finger(s), subsequent encounter, T33.532D — Superficial frostbite of left finger(s), subsequent encounter, T33.539D — Superficial frostbite of unspecified finger(s), subsequent encounter, T33.60XD — Superficial frostbite of unspecified hip and thigh, subsequent encounter, +149 more

Contextual Map

Every relationship of T33.3XXD 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 T33.3XXD with these 9 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes (112)

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services[MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — 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. 1,258 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

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 T33.3XXD require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T33.

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
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 — v44 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

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. "T33.3XXD — Superficial frostbite of abdominal wall, lower back and pelvis, subsequent encounter." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/t33.3xxd-superficial-frostbite-of-abdominal-wall-lower-back-and-pelvis-subsequent-encounter

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Superficial frostbite of abdominal wall, lower back and pelvis, subsequent encounter

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, 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 T33.3XXD in its code family, with their registry titles.

View all codes in the T33 family