2027 ICD-10-CM Diagnosis Code B55.9Leishmaniasis, unspecified
ICD-10-CM Codes›A00–B99›B50-B64›B55
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B55.9 is a billable ICD-10-CM diagnosis code for leishmaniasis, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 69 closely related codes. Coders also document this condition as hemorrhagic leishmaniasis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hemorrhagic leishmaniasis
- Infection by Leishmania infantum
- Leishmanial pneumonia
- Leishmaniasis
- Panamanian leishmaniasis
- Pneumonia due to parasitic infestation
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B55.9: its own notes plus those printed at block B50-B64 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B55.9, its category, or a range that includes it.
Applicable To 1
These notes mention B55.9.
- O98.6 Protozoal diseases complicating pregnancy, childbirth and the puerperium
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Leishmaniasis B55.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Leishmaniasis
a disease caused by any of a number of species of protozoa in the genus leishmania. there are four major clinical types of this infection: cutaneous (old and new world) (leishmaniasis, cutaneous), diffuse cutaneous (leishmaniasis, diffuse cutaneous), mucocutaneous (leishmaniasis, mucocutaneous), and visceral (leishmaniasis, visceral).
Patient EducationClinical
Leishmaniasis
Leishmaniasis is a parasitic disease spread by the bite of infected sand flies. There are several different forms of leishmaniasis. The most common are cutaneous and visceral. The cutaneous type causes skin sores. The visceral type affects internal organs such as the spleen, liver, and bone marrow.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B55.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B55.9Overview
What is the ICD-10 code for leishmaniasis, unspecified?
The ICD-10-CM code for leishmaniasis, unspecified is B55.9 (sometimes written as B559). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B55.9 (Leishmaniasis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report leishmaniasis, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B55.9 group to?
When leishmaniasis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B55.9 a CC or MCC?
CMS lists B55.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 69 closely related codes in its exclusion list.
Can B55.9 be reported with a code from A06?
Not as a rule. The Excludes1 note at block B50-B64, which applies to B55.9, lists "amebiasis (A06.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
