DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

A91 diagnosis code · Billable category · FY2027

A91 Dengue hemorrhagic fever

  • Billable
  • CC
  • POA reported

A91 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. A90-A99 Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)
  3. A91 Dengue hemorrhagic fever
CC / MCC
CC
MS-DRG
865-866
HCC V28
–
POA
Reported
Code Editor
–
Index entries
17

Instructions

Notes that also apply

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

Index entries

  • Bangkok hemorrhagic fever → A91
  • Singapore hemorrhagic fever → A91
  • Southeast Asian hemorrhagic fever → A91
  • Thailand hemorrhagic fever → A91
  • Dengue (classical) (fever)hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Bangkok hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Philippine hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Singapore hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Southeast Asia hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)Thailand hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)dengue (virus)hemorrhagic → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSBangkok → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSdengue (virus) → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSPhilippine → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSSingapore → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSSoutheast Asia → A91
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSThailand → A91

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

Medicare grouping and edits

CMS files for A91
CC / MCCCC
PDX exclusion list0152 (23 codes)
Appendix BMDC 18 Infectious and Parasitic Diseases, Systemic or Unspecified Sites, MS-DRG 865-866 (Viral Illness with MCC…)
Code Editor–
POAReported
HCC V28–

CC as a secondary diagnosis, not when the principal diagnosis is on its PDX exclusion list.

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

Hierarchy