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ICD-10 Code A18.3: Tuberculosis of intestines, peritoneum and mesenteric glands

A18.3 is an ICD-10 diagnosis entry used to group records related to Tuberculosis of intestines, peritoneum and mesenteric glands. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

đź“‹Clinical overview

This ICD-10 code is commonly used when documentation describes extrapulmonary tuberculosis affecting bones, joints, genitourinary organs, lymph nodes, abdominal structures, skin, eye, ear, endocrine organs, heart, spleen, or other named sites. The most accurate code depends on the documented organ site and whether the chart names a more specific anatomic location.

When is it used?

  • May be used when a clinician documents tuberculosis of intestines, peritoneum and mesenteric glands in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
  • This entry may represent a broader category rather than the most specific billable code.

đź©şClinical context

When commonly used
  • Infectious-disease, inpatient, specialty, and follow-up documentation where tuberculosis is documented outside the lungs and the affected organ system changes code specificity.
  • Coding and utilization-review workflows where the chart clearly identifies extrapulmonary tuberculosis involving bone, genitourinary organs, lymph nodes, abdomen, skin, eye, ear, endocrine organs, heart, spleen, or another named site.
Common management context
  • Extrapulmonary-tuberculosis follow-up often includes microbiology, pathology, imaging, organ-specific monitoring, and infectious-disease treatment planning based on the affected site.
  • Documentation usually becomes more specific when the chart identifies the exact organ, structure, or body system involved rather than using a broader 'other organs' tuberculosis label.
  • Specialist context already linked on this page includes Infectious Disease Specialist, General Physician.

🔍Key distinctions

Important notes
  • This ICD-10 family covers extrapulmonary or other-organ tuberculosis and is distinct from pulmonary tuberculosis branches because the affected organ site drives code selection.
  • Specific anatomic-site detail matters here, because spine, kidney, bladder, thyroid, adrenal, heart, spleen, skin, eye, ear, and other named organ involvement are coded separately when documented.
  • Abdominal or retroperitoneal tuberculosis is coded separately from bone, genitourinary, skin, eye, endocrine, and other extrapulmonary tuberculosis sites when the affected internal structure is documented more specifically.
Related codes to consider
A18.31Tuberculous peritonitis
Related extrapulmonary-tuberculosis ICD-10 code; documentation often becomes more specific when the chart identifies the affected organ system or names a more precise anatomic site.
A18.32Tuberculous enteritis
Related extrapulmonary-tuberculosis ICD-10 code; documentation often becomes more specific when the chart identifies the affected organ system or names a more precise anatomic site.
A18.39Retroperitoneal tuberculosis
Related extrapulmonary-tuberculosis ICD-10 code; documentation often becomes more specific when the chart identifies the affected organ system or names a more precise anatomic site.

Code hierarchy

chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A15-A19Tuberculosis
category
A18Tuberculosis of other organs
currentA18

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Infectious Disease SpecialistGeneral Physician

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
A18.3
Replacement codes
A18.31 — Tuberculous peritonitisA18.32 — Tuberculous enteritisA18.39 — Retroperitoneal tuberculosis

Common synonyms

Tuberculosis of intestines, peritoneum and mesenteric glands

Frequently asked questions

Code details

CodeA18.3
SystemICD10
Display nameTuberculosis of intestines, peritoneum and mesenteric glands
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockTuberculosis

Flags

BillableNo
Valid clinical useNo

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.