2026 ICD-10-CM Diagnosis Code J84.82Adult pulmonary Langerhans cell histiocytosis
ICD-10-CM Codes›J00–J99›J80-J84›J84
- Billable — Valid for Submission
- Chronic Condition
J84.82 is a billable ICD-10-CM diagnosis code for adult pulmonary Langerhans cell histiocytosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 196 through 198. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for J84.82.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adult pulmonary Langerhans cell histiocytosis
- Langerhans cell histiocytosis of lung
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Adult PLCH
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Histiocytosis - D76.3
- Langerhans' cell NEC - C96.6
- pulmonary, adult (adult PLCH) - J84.82
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Histiocytosis
- Langerhans' cell NEC
- pulmonary, adult (adult PLCH)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Interstitial Lung Diseases
Interstitial lung disease is the name for a large group of diseases that inflame or scar the lungs. The inflammation and scarring make it hard to get enough oxygen. The scarring is called pulmonary fibrosis.
Read the full article at MedlinePlus
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Convert J84.82 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J84.82Overview
Is J84.82 (Other specified interstitial pulmonary diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report adult pulmonary Langerhans cell histiocytosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J84.82 group to?
When adult pulmonary Langerhans cell histiocytosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 196, 197, 198, with relative weights from 0.7162 to 1.8872 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can J84.82 be reported for?
The Medicare Code Editor checks adult pulmonary Langerhans cell histiocytosis against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.
What is the ICD-9 equivalent of J84.82?
Under the General Equivalence Mappings, adult pulmonary Langerhans cell histiocytosis converts to ICD-9-CM 516.5 (adlt pul Langs cell hist). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
