2027 ICD-10-CM Diagnosis Code B74.3Loiasis
ICD-10-CM Codes›A00–B99›B65-B83›B74
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B74.3 is a billable ICD-10-CM diagnosis code for loiasis. 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 13 closely related codes. Coders also document this condition as calabar swelling. 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.
- Calabar swelling
- Cerebral loiasis
- Cerebrospinal nematodiasis
- Chylocele
- Chylocele of tunica vaginalis caused by Loa loa
- Infection by Loa loa
- Infection caused by Loa
- Infestation of eyelid caused by Loa loa
- Loa loa lymphadenopathy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B74.3: its own notes plus those printed at B74 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
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Calabar swelling
- Eyeworm disease of Africa
- Loa loa infection
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 B74.3, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming B74.3: they are not reported together with it, unless the two conditions are unrelated.
Code First 3
These codes say to code first a condition named in the note, and B74.3 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Calabar swelling B74.3
Disease, diseased See Also: Syndrome;
eyeworm of Africa B74.3
Loa loa (loiasis) B74.3
Calabar B74.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Loiasis
a parasitic infection caused by the nematode loa loa. the vector in the transmission of this infection is the horsefly (tabanus) or the deerfly or mango fly (chrysops). the larvae may be seen just beneath the skin or passing through the conjunctiva. eye lesions are not uncommon. the disease is generally mild and painless.
Patient EducationClinical
Parasitic Diseases
Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B74.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B74.3Overview
What is the ICD-10 code for loiasis?
The ICD-10-CM code for loiasis is B74.3 (sometimes written as B743). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B74.3 (Filariasis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report loiasis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B74.3 group to?
When loiasis 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 B74.3 a CC or MCC?
CMS lists B74.3 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 13 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B74.3?
Under the General Equivalence Mappings, loiasis converts to ICD-9-CM 125.2 (loiasis). The mapping is a direct match.
