DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

A55 diagnosis code · Billable category · FY2027

A55 Chlamydial lymphogranuloma (venereum)

  • Billable
  • Not CC/MCC
  • POA reported

A55 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A50-A64 Infections with a predominantly sexual mode of transmission (A50-A64)
  3. A55 Chlamydial lymphogranuloma (venereum)
CC / MCC
Neither
MS-DRG
727-728, 742-743, 757-759
HCC V28
–
POA
Reported
Code Editor
–
Index entries
30

Instructions

At A55

Inclusion terms

  • Climatic or tropical bubo
  • Durand-Nicolas-Favre disease
  • Esthiomene
  • Lymphogranuloma inguinale

Notes that also apply

Block A50-A64 instructions (Excludes1 2, Excludes2 1): printed on the block page.

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Durand-Nicolas-Favre disease → A55
  • Esthiomene → A55
  • Frei's disease → A55
  • Genito-anorectal syndrome → A55
  • Lymphopathia venereum, veneris → A55
  • Nicolas (-Durand)-Favre disease → A55
  • Poradenitis, nostras inguinalis or venerea → A55
  • Buboclimatic → A55
  • Bubotropical → A55
  • Disease, diseasedDurand-Nicholas-Favre (climatic bubo) → A55
  • Disease, diseasedFavre-Durand-Nicolas (climatic bubo) → A55
  • Disease, diseasedFrei's (climatic bubo) → A55
  • Disease, diseasedNicolas (-Durand)-Favre (climatic bubo) → A55
  • Fifth diseasevenereal → A55
  • Lymphadenitisvenereal (chlamydial) → A55
  • Lymphogranuloma (malignant)chlamydial → A55
  • Lymphogranuloma (malignant)inguinale → A55
  • Lymphogranuloma (malignant)venereum (any site) (chlamydial) (with stricture of rectum) → A55
  • Syndromegenito-anorectal → A55
  • Venerealbubo → A55
  • Venereallymphogranuloma (Durand-Nicolas-Favre) → A55
  • Buboinguinal (nonspecific)climatic → A55
  • Disease, diseasedvenerealfifth → A55
  • Disease, diseasedvenerealsixth → A55
  • Infection, infected, infective (opportunistic)Chlamydia, chlamydiallymphogranuloma → A55
  • Lymphadenitisdue tochlamydial lymphogranuloma → A55
  • Lymphadenitisdue tolymphogranuloma venereum → A55
  • Stricturerectum (sphincter)inflammatory (chlamydial) → A55
  • Stricturerectum (sphincter)due tochlamydial lymphogranuloma → A55
  • Stricturerectum (sphincter)due tolymphogranuloma venereum → A55

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for A55
CC / MCCNeither
Appendix BMDC 12 Diseases and Disorders of the Male Reproductive System, MS-DRG 727-728 (Inflammation of the Male Reproductive System with MCC…); MDC 13 Diseases and Disorders of the Female Reproductive System, MS-DRG 742-743 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC…); MDC 13 Diseases and Disorders of the Female Reproductive System, MS-DRG 757-759 (Infections, Female Reproductive System with MCC…)
Code Editor–
POAReported
HCC V28–

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy