What is ICD-10 code M35.02?

M35.02 is the ICD-10-CM diagnosis code for Sjogren syndrome with lung involvement. Sjögren syndrome with involvement of the lungs, which can cause inflammation, scarring, or breathing difficulties. It belongs to the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99). M35.02 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M35.02 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. M35.02 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. M35.02 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does M35.02 map to under V28?

M35.02 maps to CMS-HCC V28 HCC 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM M35.02: Sjogren syndrome with lung

M35.02 maps to CMS-HCC V28 280. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupM35.02

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

M35.02

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

Sjogren syndrome with lung involvement

Sjögren syndrome with involvement of the lungs, which can cause inflammation, scarring, or breathing difficulties.

Buddy Insight

Sjögren syndrome with pulmonary involvement represents advanced systemic disease with potential for significant respiratory complications including interstitial lung disease and decreased pulmonary function.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 280

Chronic Obstructive Pulmonary...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 057

HHS-HCC 057 adult, RAF varies...

Code-level coefficient reference

+ HCC 162

ESRD/PACE

Mapped

HCC 40

Rheumatoid Arthritis and Infl...

Code-level coefficient reference

+ HCC 112

RXHCC

Mapped

HCC 84

Systemic Lupus Erythematosus ...

Code-level coefficient reference

+ HCC 227

Code Book Path

Official

M35Other systemic involvement of connective tissue M35.0Sjogren syndrome M35.02Sjogren syndrome with lung involvement

Inclusion Terms

Official

Sicca syndromeInherited from M35.0

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

M35.00Sjogren syndrome, unspecified M35.01Sjogren syndrome with keratoconjunctivitis M35.03Sjogren syndrome with myopathy M35.04Sjogren syndrome with tubulo-interstitial nephropathy M35.05Sjogren syndrome with inflammatory arthritis

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, M35, M35.0
reactive perforating collagenosis (L87.1)Inherited from M30-M36, M35, M35.0
dry mouth, unspecified (R68.2)Inherited from M30-M36, M35, M35.0

Code First

Official

No Code First sequencing instructions are included in this display for M35.02. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify associated manifestationsInherited from M35.0

Code Also

Official

No Code Also instructions are included in this display for M35.02. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Confirmed diagnosis of Sjögren syndrome

Pulmonary function test abnormalities

Chest imaging showing lung involvement (CT scan preferred)

Documentation of respiratory symptoms or complications

MEAT Support

HCC Buddy guidance

Confirmed diagnosis of Sjögren syndrome

Pulmonary function test abnormalities

Chest imaging showing lung involvement (CT scan preferred)

Documentation of respiratory symptoms or complications

Audit Caution

HCC Buddy guidance

Using this code without clear documentation of pulmonary involvement in Sjögren patients

Confusing incidental lung findings with Sjögren-related pulmonary disease

Not coding associated respiratory conditions separately when present

Failing to distinguish from other causes of interstitial lung disease

Common Mistakes

HCC Buddy guidance

M35.00 — Sjögren syndrome unspecified (use when lung involvement not documented)

J84.10 — Pulmonary fibrosis unspecified (use when fibrosis not related to Sjögren)

M35.03 — Sjögren syndrome with myopathy (different organ system involvement)

J44.1 — COPD with acute exacerbation (different etiology)

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 M35.02 an HCC code?

Yes. M35.02 (Sjogren syndrome with lung involvement) maps to HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.319. 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: M35.02 is billable and maps to V28 HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: M35.02
Description: Sjogren syndrome with lung involvement
HCC (V28): HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
RAF reference coefficient: 0.319
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders

0.319

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 84, Systemic Lupus Erythematosus and Other Systemic Connective Tissue Disorders

Not separately weighted

+ HCC 227, Pulmonary Fibrosis, Except IdiopathicNot 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 M35.02 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for M35.02

For M35.02, 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

Get the V28 mapping + MEAT cheat sheet

One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.

Free PDF. No card. Unsubscribe anytime.

What This Code Means

M35.02 is the ICD-10-CM diagnosis code for sjogren syndrome with lung involvement. Sjögren syndrome with involvement of the lungs, which can cause inflammation, scarring, or breathing difficulties. M35.02 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, M35.02 maps to Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders (HCC 280) with a source-labeled community, non-dual, aged reference coefficient of 0.319. No V24 mapping is shown for M35.02; use the applicable model and payment year when reviewing the V28 mapping. 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.

Pulmonary involvement may present as interstitial lung disease; ensure imaging or pulmonary function tests are documented. For M35.02, 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 M35.02 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Pulmonary involvement may present as interstitial lung disease; ensure imaging or pulmonary function tests are documented.
•Code separately for any specific lung conditions (such as interstitial pneumonia) if they are documented in addition to Sjögren syndrome.

Clinical Significance

Documentation Requirements

✓Confirmed diagnosis of Sjögren syndrome
✓Pulmonary function test abnormalities
✓Chest imaging showing lung involvement (CT scan preferred)
✓Documentation of respiratory symptoms or complications
✓Pulmonologist evaluation and recommendations
✓Exclusion of other causes of lung disease
✓Current respiratory treatment plan

Commonly Confused Codes

•M35.00: Sjögren syndrome unspecified (use when lung involvement not documented)
•J84.10: Pulmonary fibrosis unspecified (use when fibrosis not related to Sjögren)
•M35.03: Sjögren syndrome with myopathy (different organ system involvement)
•J44.1: COPD with acute exacerbation (different etiology)