ICD-10-CM FY2027 addition
J4B ICD-10-CM Code: Pulmonary mycetoma
New for FY2027: effective October 1, 2026
J4B is one of the 238 entries the FY2027 order file adds. It is not reportable for dates of service before October 1, 2026.
Risk adjustment status: the PY2027 Initial ICD-10-CM mapping does not list this code, so no HCC or coefficient is shown. A later CMS mapping file must pass source verification before a mapping appears here.
Source: CMS FY2027 order and addenda files, staged 2026-07-13. All FY2027 changes
- Effective
- October 1, 2026 (FY2027)
- Order-file status
- Billable code
- CMS-HCC V28
- Mapping pending a verified PY2027 source
- Category
- J4B
Frequently asked questions
When can J4B be reported?
J4B (Pulmonary mycetoma) is new in the FY2027 ICD-10-CM code set, effective October 1, 2026. It applies to dates of service on or after that date; it is not valid in the FY2026 set that runs through September 30, 2026.
Is J4B a billable code?
Yes. The FY2027 order file flags J4B as a billable code, so it can be reported on a claim from October 1, 2026 when the documentation supports it.
Does J4B map to an HCC?
Not yet known from a verified source. The PY2027 Initial ICD-10-CM mapping file does not list J4B, so HCC Buddy shows no HCC category or coefficient for it. A later CMS mapping file must pass source verification before a mapping appears on this page.
Source: CMS FY2027 ICD-10-CM order and addenda files (icd10cm_order_2027.txt), reconciled against the FY2026 April order file. Full tabular notes, MEAT guidance, and mapping detail appear here once the FY2027edition is served by the encoder. See all 238 new codes