2027 ICD-10-CM Diagnosis Code J84.112Idiopathic pulmonary fibrosis
ICD-10-CM Codes›J00–J99›J80-J84›J84
- Billable — Valid for Submission
- Risk Adjusts — HCC 278
- Chronic Condition
J84.112 is a billable ICD-10-CM diagnosis code for idiopathic pulmonary fibrosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 196 through 198. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.
For Medicare Advantage risk adjustment, J84.112 maps to CMS-HCC Category 278 (Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis) under the V28 model, adding a risk factor of about 0.818 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
J84.112 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.
- Acute exacerbation of idiopathic pulmonary fibrosis
- Chronic interstitial pneumonitis
- Diffuse interstitial pulmonary fibrosis
- Familial idiopathic pulmonary fibrosis
- Familial pulmonary fibrosis
- Idiopathic pleuroparenchymal fibroelastosis
- Idiopathic pulmonary fibrosis
- Pleuroparenchymal fibroelastosis
- Pleuroparenchymal fibroelastosis due to connective tissue disease
- Pleuroparenchymal fibroelastosis due to idiopathic pulmonary fibrosis
- Prolonged pulmonary alveolitis
- Secondary pleuroparenchymal fibroelastosis
- Usual interstitial pneumonia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to J84.112: its own notes plus those printed at J84.11, J84.1, J84, and Chapter 10. A note printed at a category, block or chapter applies to every code under it.
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.
- Cryptogenic fibrosing alveolitis
- Idiopathic fibrosing alveolitis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- pulmonary fibrosis (chronic) following radiation (J70.1)
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.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- smoke inhalation (T59.81-)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- if applicable, pulmonary fibrosis (chronic) due to inhalation of chemicals, gases, fumes or vapors (J68.4)
- if applicable, associated condition
Notes
General instructions on how these codes are used.
- When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name J84.112, its category, or a range that includes it.
Use Additional Code 1
These codes say to use an additional code from the note, and J84.112 is one of the codes named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
lung (atrophic) (chronic) (confluent) (massive) (perialveolar) (peribronchial) J84.10
idiopathic J84.112
pulmonary See Also: Fibrosis, lung; J84.10
idiopathic J84.112
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Idiopathic Pulmonary Fibrosis
a common interstitial lung disease of unknown etiology, usually occurring between 50-70 years of age. clinically, it is characterized by an insidious onset of breathlessness with exertion and a nonproductive cough, leading to progressive dyspnea. pathological features show scant interstitial inflammation, patchy collagen fibrosis, prominent fibroblast proliferation foci, and microscopic honeycomb change.
Patient EducationClinical
Pulmonary Fibrosis
Pulmonary fibrosis is a condition in which the tissue deep in your lungs becomes scarred over time. This tissue gets thick and stiff. That makes it hard for you to catch your breath, and your blood may not get enough oxygen.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J84.112 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J84.112Overview
What is the ICD-10 code for idiopathic pulmonary fibrosis?
The ICD-10-CM code for idiopathic pulmonary fibrosis is J84.112 (sometimes written as J84112). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is J84.112 (Idiopathic interstitial pneumonia) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report idiopathic pulmonary fibrosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does J84.112 group to?
When idiopathic pulmonary fibrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 198, 197, 196, with relative weights from 0.7256 to 1.8335 depending on complications. Higher weights mean higher Medicare reimbursement.
Can J84.112 be reported with J84.2?
Not as a rule. The Excludes1 note at J84.11, which applies to J84.112, lists "lymphoid interstitial pneumonia (J84.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of J84.112?
Under the General Equivalence Mappings, idiopathic pulmonary fibrosis converts to ICD-9-CM 516.31 (idiopath pulmon fibrosis). The mapping is a direct match.
What HCC is J84.112?
J84.112 (idiopathic pulmonary fibrosis) maps to CMS-HCC Category 278 (Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis), commonly written as HCC 278, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 112 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 226.
Does J84.112 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, J84.112 adds a risk adjustment factor of about 0.818 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.650 to 1.640 depending on the payment segment). A more severe related category (HCC 276 and HCC 277) supersedes it when both are reported. See the full factor table on the HCC 278 category page.
