B83.4Internal hirudiniasis

B83.4 is the ICD-10-CM diagnosis code for internal hirudiniasis. It belongs to category B83 (other helminthiases), block B65-B83 (helminthiases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B83 (other helminthiases), B83.4 is specifically for internal hirudiniasis. Related codes cover visceral larva migrans (B83.0), Gnathostomiasis (B83.1), angiostrongyliasis due to Parastrongylus cantonensis (B83.2), Syngamiasis (B83.3), other specified helminthiases (B83.8) and helminthiasis, unspecified (B83.9).

The conditions in its Excludes2 note aren't part of B83.4, but may be coded alongside it if the patient has both: external hirudiniasis (B88.3).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 134.2 (hirudiniasis).