T81.83 ICD-10-CM Code: Persistent postprocedural fistula

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T81.83 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on T81.83 itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to each code from category T81"

• 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

T81.83XA, T81.83XD, T81.83XS

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 T81.83

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

Before you code T81.83

1. T81.83 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).

   ReviewT81.83XA, T81.83XD, T81.83XS

   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. T81.83 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 →

Choose the right path

1. Does the documentation support one of the more specific codes beneath T81.83?
   Yes → Select that code and continue the checks below on its own page.
   No → T81.83 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewT81.83XA, T81.83XD, T81.83XS

2. 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 T81.83. Then work the Use Additional Code note and review the Code Also note, and 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).

Encounter type

Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).

The conditions the Use Additional Code note names

Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

Official instructions as workflow

• Excludes2 — not part of T81.83(33 notes)

  Coding workflow: The conditions named in this note are not included in T81.83. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareT88.51, T88.3, T80, T86, L23.3, L24.4

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

• Use Additional Code — after identifying T81.83(8 notes)

  Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with T81.83 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

  ReviewK60.3, K60.5, N32.2, N82.4

  See the official tabular notes · Guidelines I.A.13

• Code Also — related condition(1 note)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  ReviewT81.32

  See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

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

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.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Complication (s) (from) (of), surgical procedure (on), fistula (persistent postoperative)
• Fistula (cutaneous), postoperative, persistent

Don’t confuse T81.83 with…

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

The codes most likely to be picked instead of T81.83 — 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.

• T81.83XA— 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 T81.83XA.

  Full comparison: T81.83 vs T81.83XA →

• T81.83XD— 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 T81.83XD.

  Full comparison: T81.83 vs T81.83XD →

• T88.51— 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 following anesthesia adds T88.51; it is not part of this code and both may be reported when both are documented.

  Full comparison: T81.83 vs T88.51 →

• T88.3— 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 malignant hyperpyrexia due to anesthesia adds T88.3; it is not part of this code and both may be reported when both are documented.

  Full comparison: T81.83 vs T88.3 →

• T88.0— 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 complications following immunization adds T88.0; it is not part of this code and both may be reported when both are documented.

  Full comparison: T81.83 vs T88.0 →

• T88.1— 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 complications following immunization adds T88.1; it is not part of this code and both may be reported when both are documented.

  Full comparison: T81.83 vs T88.1 →

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.

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. 8 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
3. 1 Code Also note — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
4. 33 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

• Not billable as written — a more specific code is required: T81.83XA, T81.83XD, T81.83XS.
• Requires a 7th character. "The appropriate 7th character is to be added to each code from category T81" Options: T81.83XA, T81.83XD, T81.83XS

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 T81.83 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: T88.7 — Unspecified adverse effect of drug or medicament (via T81.-).

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

Referenced by 3 Excludes2 notes: T78 — Adverse effects, not elsewhere classified (via T81.-), T79 — Certain early complications of trauma, not elsewhere classified (via T81.-), T88 — Other complications of surgical and medical care, not elsewhere classified (via T81.-).

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

Referenced by 1 Code First instruction: J98.51 — Mediastinitis (via T81.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Related Codes

Same Index main term, other category

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

Q34.8 — Other specified congenital malformations of respiratory system (laryngotracheal, congenital), Q38.0 — Congenital malformations of lips, not elsewhere classified (lip, congenital), Q38.4 — Congenital malformations of salivary glands and ducts (salivary duct or gland, congenital), Q39.1 — Atresia of esophagus with tracheo-esophageal fistula (esophagus, congenital, with atresia of esophagus), Q39.2 — Congenital tracheo-esophageal fistula without atresia (esophagus, congenital), Q40.2 — Other specified congenital malformations of stomach (gastrocolic, congenital), Q42.0 — Congenital absence, atresia and stenosis of rectum with fistula (rectum, congenital, with absence, atresia and stenosis), Q42.2 — Congenital absence, atresia and stenosis of anus with fistula (anus, anal, congenital, with absence, atresia and stenosis), Q43.6 — Congenital fistula of rectum and anus (fecal, congenital), Q44.5 — Other congenital malformations of bile ducts (cystic duct, congenital), Q51.7 — Congenital fistulae between uterus and digestive and urinary tracts (uterourethral), Q52.2 — Congenital rectovaginal fistula (rectovaginal, congenital), Q52.79 — Other congenital malformations of vulva (rectovulval, congenital), Q55.7 — Congenital vasocutaneous fistula (vasocutaneous, congenital), Q64.4 — Malformation of urachus (urachus, congenital), Q64.73 — Congenital urethrorectal fistula (rectourethral, congenital), Q64.79 — Other congenital malformations of bladder and urethra (urethra, congenital), Q64.8 — Other specified congenital malformations of urinary system (umbilicourinary), Q89.2 — Congenital malformations of other endocrine glands (thyroglossal duct), Z99.2 — Dependence on renal dialysis (arteriovenous, surgically created), +114 more

Contextual Map

Every relationship of T81.83 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 T81.83 with these 10 related codes in Claim Check

Hierarchy

• S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Use Additional Code

• K60.3 — Anal fistula[Use Additional Code]: “anal fistula (K60.3-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• K60.5 — Anorectal fistula[Use Additional Code]: “anorectal fistula (K60.5-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N32.2 — Vesical fistula, not elsewhere classified[Use Additional Code]: “bladder fistula (N32.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N82.4 — Other female intestinal-genital tract fistulae[Use Additional Code]: “other female intestinal-genital tract fistulae (N82.4)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Code Also

• T81.32 — Disruption of internal operation (surgical) wound, not elsewhere classified[Code Also]: “, if applicable, disruption of internal operation (surgical) wound (T81.32-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes1 notes

• T88.7 — Unspecified adverse effect of drug or medicament[Excludes1](via T81.-): “specified adverse effects of drugs and medicaments (A00-R94 and T80-T88.6, T88.8)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• T78 — Adverse effects, not elsewhere classified[Excludes2](via T81.-): “complications of surgical and medical care NEC (T80-T88)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T79 — Certain early complications of trauma, not elsewhere classified[Excludes2](via T81.-): “complications occurring during or following medical procedures (T80-T88)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• T88 — Other complications of surgical and medical care, not elsewhere classified[Excludes2](via T81.-): “complication following procedure NEC (T81.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code First instructions

• J98.51 — Mediastinitis[Code First](via T81.-): “underlying condition, if applicable, such as postoperative mediastinitis (T81.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Index entries

• Complication (s) (from) (of), surgical procedure (on), fistula (persistent postoperative)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Fistula (cutaneous), postoperative, persistent[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• T81 — Complications of procedures, not elsewhere classified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.710 — Complication of mesenteric artery following a procedure, not elsewhere classified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.710A — Complication of mesenteric artery following a procedure, not elsewhere classified, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.710D — Complication of mesenteric artery following a procedure, not elsewhere classified, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.710S — Complication of mesenteric artery following a procedure, not elsewhere classified, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.711 — Complication of renal artery following a procedure, not elsewhere classified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.711A — Complication of renal artery following a procedure, not elsewhere classified, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T81.711D — Complication of renal artery following a procedure, not elsewhere classified, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

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

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

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T81.83 in its code family, with their registry titles.

• T81.81XS — Complication of inhalation therapy, sequela
• T81.82 — Emphysema (subcutaneous) resulting from a procedure
• T81.82XA — Emphysema (subcutaneous) resulting from a procedure, initial encounter
• T81.82XD — Emphysema (subcutaneous) resulting from a procedure, subsequent encounter
• T81.82XS — Emphysema (subcutaneous) resulting from a procedure, sequela
• T81.83XA — Persistent postprocedural fistula, initial encounter
• T81.83XD — Persistent postprocedural fistula, subsequent encounter
• T81.83XS — Persistent postprocedural fistula, sequela
• T81.89 — Other complications of procedures, not elsewhere classified
• T81.89XA — Other complications of procedures, not elsewhere classified, initial encounter

View all codes in the T81 family