2027 ICD-10-CM Diagnosis Code B44.89Other forms of aspergillosis
ICD-10-CM Codes›A00–B99›B35-B49›B44
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 6
- Not Chronic
B44.89 is a billable ICD-10-CM diagnosis code for other forms of aspergillosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793, 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 12 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Fungal infections.
For Medicare Advantage risk adjustment, B44.89 maps to CMS-HCC Category 6 (Opportunistic Infections) under the V28 model, adding a risk factor of about 0.381 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
B44.89 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aspergilloma
- Aspergillosis enteritis of intestine
- Aspergillosis enteritis of small intestine
- Aspergillus colitis
- Aspergillus endophthalmitis
- Aspergillus esophagitis
- Aspergillus meningitis
- Aspergillus mycotic cerebral aneurysm
- Aspergillus otomycosis
- Central nervous aspergilloma
- Cerebral abscess
- Cerebral abscess caused by Aspergillus
- Cerebrovascular accident with intracranial hemorrhage
- Chronic aspergillosis of paranasal sinus
- Chronic suppurative otitis media caused by Aspergillus
- Cutaneous aspergillosis
- Endogenous Aspergillus endophthalmitis
- Endogenous endophthalmitis
- Endogenous fungal endophthalmitis
- Fungal colitis
- Fungal endophthalmitis
- Fungal esophagitis
- Fungal infection of cerebrum
- Fungal meningitis
- Fungal myocarditis
- Hemorrhagic cerebral infarction
- Hemorrhagic cerebral infarction caused by Aspergillus
- Hemorrhagic infarction
- Invasive aspergillosis
- Invasive aspergillosis of brain
- Invasive aspergillosis of digestive tract
- Invasive aural aspergillosis
- Invasive cardiac aspergillosis
- Invasive cutaneous aspergillosis
- Invasive ocular aspergillosis
- Myelitis caused by Aspergillus
- Myelitis caused by fungus
- Myocarditis caused by Aspergillus
- Onychomycosis caused by Aspergillus
- Pleural aspergillosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B44.89: its own notes plus those printed at B44, block B35-B49, 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
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.-)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B44.89, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming B44.89: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Ear See Also: condition;
aspergillosis B44.89
aspergillosis B44.89
aspergillosis B44.89
aspergillosis B44.89
aspergillosis B44.89
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Aspergillosis
infections with fungi of the genus aspergillus.
Patient EducationClinical
Aspergillosis
Aspergillosis is a disease caused by a fungus (or mold) called Aspergillus. The fungus is very common in both indoors and outdoors. Most people breathe in the spores of the fungus every day without being affected. But some people get the disease. It usually occurs in people with lung diseases or weakened immune systems.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B44.89 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B44.89Overview
What is the ICD-10 code for other forms of aspergillosis?
The ICD-10-CM code for other forms of aspergillosis is B44.89 (sometimes written as B4489). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B44.89 (Other forms of aspergillosis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other forms of aspergillosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B44.89 group to?
When other forms of aspergillosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 867, 869, 868, with relative weights from 0.6784 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B44.89 a CC or MCC?
CMS lists B44.89 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 12 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B44.89?
Under the General Equivalence Mappings, other forms of aspergillosis converts to ICD-9-CM 117.3 (aspergillosis). The mapping is approximate, so confirm the match fits the documentation.
What HCC is B44.89?
B44.89 (other forms of aspergillosis) maps to CMS-HCC Category 6 (Opportunistic Infections), commonly written as HCC 6, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 6 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 5.
Does B44.89 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, B44.89 adds a risk adjustment factor of about 0.381 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.381 to 0.833 depending on the payment segment). HCC 6 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 6 category page.
