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M34.81 ICD-10-CM Code: Systemic sclerosis with lung involvement

M34.81 maps to CMS-HCC V28 HCCs 93 and 278. Source-labeled RAF references are available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupM34.81

FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Systemic connective tissue disorders (M30-M36)

M34.81

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Systemic sclerosis with lung involvement

Systemic sclerosis with involvement of the lungs, causing breathing difficulties and reduced lung function.

Buddy the Bee presenting code insight

Buddy Insight

Systemic sclerosis with lung involvement represents a major complication that can lead to pulmonary fibrosis, pulmonary hypertension, and respiratory failure.

OverviewRisk ModelsCode BookDocumentationAuditNotesEdition comparison

CMS-HCC V28

HCC 93

Coefficient HCC 93: 0.617 (Community Non-Dual Aged (CNA)); HCC 278: 0.818 (Community Non-Dual Aged (CNA))

+ HCC 278

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 056

Code-level coefficient reference

+ HCC 162

ESRD/PACE

HCC 40

Code-level coefficient reference

+ HCC 112

RXHCC

HCC 82

Code-level coefficient reference

+ HCC 226

Code Book Path

Official
M34Systemic sclerosis [scleroderma]M34.8Other forms of systemic sclerosisM34.81Systemic sclerosis with lung involvement

Inclusion Terms

Official

No inclusion terms are included in this display for M34.81. Check the code and parent instructions in the Code Book.

Excludes 2

Official
  • arthropathic psoriasis (L40.5-)Inherited from M00-M99
  • certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99
  • certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99
  • compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99
  • endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99
  • injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99
  • neoplasms (C00-D49)Inherited from M00-M99
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99

Related Codes

Official
M34.82Systemic sclerosis with myopathyM34.83Systemic sclerosis with polyneuropathyM34.89Other systemic sclerosis

Includes

Official
  • autoimmune disease NOSInherited from M30-M36
  • collagen (vascular) disease NOSInherited from M30-M36
  • systemic autoimmune diseaseInherited from M30-M36
  • systemic collagen (vascular) diseaseInherited from M30-M36

Excludes 1

Official
  • autoimmune disease, single organ or single cell-type -code to relevant condition categoryInherited from M30-M36, M34
  • circumscribed scleroderma (L94.0)Inherited from M30-M36, M34
  • neonatal scleroderma (P83.88)Inherited from M30-M36, M34

Code First

Official

No Code First sequencing instructions are included in this display for M34.81. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for M34.81. Check the code and parent instructions in the Code Book.

Code Also

Official
  • if applicable:
  • other interstitial pulmonary diseases (J84.89)
  • secondary pulmonary arterial hypertension (I27.21)

Buddy Documentation Tip

HCC Buddy guidance
Confirmed systemic sclerosis diagnosis
Documentation of pulmonary involvement
High-resolution chest CT showing interstitial changes
Pulmonary function tests showing restriction or decreased DLCO

MEAT Support

HCC Buddy guidance
Confirmed systemic sclerosis diagnosis
Documentation of pulmonary involvement
High-resolution chest CT showing interstitial changes
Pulmonary function tests showing restriction or decreased DLCO

Audit Caution

HCC Buddy guidance
Using idiopathic lung disease codes when scleroderma is the cause
Missing pulmonary function test documentation
Failing to assess for pulmonary hypertension
Not excluding other causes of interstitial lung disease

Common Mistakes

HCC Buddy guidance
J84.10 — Use for idiopathic pulmonary fibrosis, not scleroderma-related
I27.0 — Use additionally for pulmonary hypertension when present
M34.0 — Use when lung involvement is part of progressive systemic sclerosis
J44.1 — Use for COPD, not scleroderma lung disease

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is M34.81 an HCC code?

Yes. M34.81 (Systemic sclerosis with lung involvement) maps to HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders and HCC 278, Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis under the CMS-HCC V28 risk adjustment model, with source-labeled community non-dual aged reference coefficients HCC 93 0.617 and HCC 278 0.818. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: M34.81 is billable and maps to V28 HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders and HCC 278, Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
M34.81
Description
Systemic sclerosis with lung involvement
HCC (V28)
HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders; HCC 278 — Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis
RAF reference coefficient
HCC 93: 0.617; HCC 278: 0.818
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
0.617
+ HCC 278, Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis0.818
ESRDHCC 40, Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
Not separately weighted
+ HCC 112, Fibrosis of Lung and Other Chronic Lung DisordersNot separately weighted
RxHCCHCC 82, Systemic Sclerosis
Not separately weighted
+ HCC 226, Idiopathic Pulmonary Fibrosis and Systemic Sclerosis with Lung InvolvementNot separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work M34.81 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for M34.81

For M34.81, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

M34.81 is the ICD-10-CM diagnosis code for systemic sclerosis with lung involvement. Systemic sclerosis with involvement of the lungs, causing breathing difficulties and reduced lung function. M34.81 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering systemic connective tissue disorders (m30-m36).

Under the CMS-HCC V28 risk adjustment model, M34.81 maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders (HCC 93) with a source-labeled community, non-dual, aged reference coefficient of 0.617. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Document the type of lung involvement (pulmonary fibrosis, pulmonary hypertension, etc.) for specificity. For M34.81, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M34.81 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Document the type of lung involvement (pulmonary fibrosis, pulmonary hypertension, etc.) for specificity
  • •Consider additional codes for pulmonary function test results or specific respiratory complications

Clinical Significance

Systemic sclerosis with lung involvement represents a major complication that can lead to pulmonary fibrosis, pulmonary hypertension, and respiratory failure. This manifestation significantly worsens prognosis and requires immediate pulmonology consultation and aggressive treatment.

Documentation Requirements

  • ✓Confirmed systemic sclerosis diagnosis
  • ✓Documentation of pulmonary involvement
  • ✓High-resolution chest CT showing interstitial changes
  • ✓Pulmonary function tests showing restriction or decreased DLCO
  • ✓Echocardiogram or right heart catheterization for pulmonary hypertension
  • ✓Exclusion of other causes of lung disease
  • ✓Treatment plan including lung-protective strategies
  • ✓Monitoring plan for respiratory function

Code Also

  • if applicable:
  • other interstitial pulmonary diseases (J84.89)
  • secondary pulmonary arterial hypertension (I27.21)

Commonly Confused Codes

  • •J84.10: Use for idiopathic pulmonary fibrosis, not scleroderma-related
  • •I27.0: Use additionally for pulmonary hypertension when present
  • •M34.0: Use when lung involvement is part of progressive systemic sclerosis
  • •J44.1: Use for COPD, not scleroderma lung disease

Child Codes

M34.81Systemic sclerosis with lung involvement
HCC 93
M34.82Systemic sclerosis with myopathy
HCC 93
M34.83Systemic sclerosis with polyneuropathy
HCC 93
M34.89Other systemic sclerosis
HCC 93

Code Hierarchy

└M34Systemic sclerosis [scleroderma]└M34.8Other forms of systemic sclerosis└M34.81Systemic sclerosis with lung involvement
└M34.81Systemic sclerosis with lung involvement

Also searched as

  • M34 81
  • M3481

For M34.81, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

M34.81 maps to CMS-HCC V28 category 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders and CMS-HCC V28 category 278, Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies payment HCC categories for M34.81. Review their source-labeled HCC coefficients above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

Work M34.81 in HCC Buddy

Open M34.81 in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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