2027 ICD-10-CM Diagnosis Code J84.03Idiopathic pulmonary hemosiderosis
ICD-10-CM Codes›J00–J99›J80-J84›J84
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 280
- Chronic Condition
J84.03 is a billable ICD-10-CM diagnosis code for idiopathic pulmonary hemosiderosis. 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. 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 90 closely related codes. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as hemosiderosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified lower respiratory disease.
For Medicare Advantage risk adjustment, J84.03 maps to CMS-HCC Category 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders) under the V28 model, adding a risk factor of about 0.319 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for J84.03.
Medicare Risk Adjustment (HCC)Billing
J84.03 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.
- Hemosiderosis
- Idiopathic pulmonary hemosiderosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to J84.03: its own notes plus those printed at 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.
- Essential brown induration of lung
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- acute idiopathic pulmonary hemorrhage in infants [AIPHI] (R04.81)
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 First
The underlying condition named in the note is sequenced before this code.
- underlying disease, such as:
- disorders of iron metabolism (E83.1-)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- 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 J84.03, its category, or a range that includes it.
Use Additional Code 1
These codes say to use an additional code from the note, and J84.03 is one of the codes named.
- E83.19 Other disorders of iron metabolismcode, if applicable, for idiopathic pulmonary hemosiderosis (J84.03)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
lung (black) (chronic) (fibroid) See Also: Fibrosis, lung; J84.10
essential brown J84.03
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
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J84.03 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J84.03Overview
What is the ICD-10 code for idiopathic pulmonary hemosiderosis?
The ICD-10-CM code for idiopathic pulmonary hemosiderosis is J84.03 (sometimes written as J8403). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is J84.03 (Alveolar and parieto-alveolar conditions) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report idiopathic pulmonary hemosiderosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does J84.03 group to?
On inpatient claims, idiopathic pulmonary hemosiderosis maps to MS-DRG 198, 197, 196, with relative weights from 0.7256 to 1.8335 depending on complications. Higher weights mean higher Medicare reimbursement.
Is J84.03 a CC or MCC?
CMS lists J84.03 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 90 closely related codes in its exclusion list.
Can J84.03 be a principal diagnosis?
No. This is a manifestation code: idiopathic pulmonary hemosiderosis describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
What HCC is J84.03?
J84.03 (idiopathic pulmonary hemosiderosis) maps to CMS-HCC Category 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders), commonly written as HCC 280, 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 227.
Does J84.03 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, J84.03 adds a risk adjustment factor of about 0.319 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.209 to 0.390 depending on the payment segment). A more severe related category (HCC 276, HCC 277, HCC 278, and HCC 279) supersedes it when both are reported. See the full factor table on the HCC 280 category page.
