ICD-10 Code I08.2: Rheumatic disorders of both aortic and tricuspid valves

Key Takeaways

ICD-10 Code I08.2 describes rheumatic disorders affecting both the aortic and tricuspid valves simultaneously, caused by rheumatic fever sequelae.

I08.2 has been a valid, billable ICD-10-CM code since the original ICD-10-CM implementation on October 1, 2015 (FY2016), unchanged through the current FY2026 edition, and it remains acceptable for reimbursement claims.

Documentation must confirm rheumatic etiology and involvement of both valves. Assigning non-rheumatic codes (I34-I38) when the cause is rheumatic is a common and costly coding error.

Practice management software like Pabau helps cardiology and internal medicine practices attach correct diagnosis codes to patient records and reduce claim errors.

ICD-10 Code I08.2 is a billable code for rheumatic disorders affecting both the aortic and tricuspid valves. Coders assign it when documentation confirms rheumatic fever damaged both valves at the same time, rather than defaulting to a non-rheumatic code that mismatches the physician’s own notes.

This reference covers the code’s clinical description, hierarchy, coding notes, MS-DRG mapping, documentation requirements, and the most frequent errors coders make with multi-valve rheumatic disease.

According to the Centers for Medicare and Medicaid Services (CMS), ICD-10-CM codes are updated annually on October 1. I08.2 has been part of the code set since the original ICD-10-CM implementation on October 1, 2015 (FY2016), and every annual update since then has listed it as “No change.”

That includes the current FY2026 edition, effective October 1, 2025 through September 30, 2026. The code remains valid for all inpatient and outpatient claims submitted under the current code year.

ICD-10 Code I08.2: Definition and billable status

ICD-10 Code I08.2 is a billable, specific diagnosis code that represents rheumatic disorders of both the aortic and tricuspid valves. “Billable” means it carries enough clinical specificity to be submitted directly on a claim for reimbursement. No further sub-coding is required.

Coders can verify current validity for any fiscal year using the CDC/NCHS ICD-10-CM web tool, which is updated annually in line with the CMS tabular list release.

Clinical description: rheumatic disorders of both aortic and tricuspid valves

This code applies when rheumatic fever has damaged both the aortic and tricuspid valves in the same patient. Rheumatic fever triggers an inflammatory process that scars valve leaflets over years, leading to stenosis, insufficiency, or a combined presentation. When both the aortic and tricuspid valves are affected by this rheumatic process, I08.2 is the correct assignment.

Key clinical features that support this diagnosis include documented rheumatic etiology (typically a history of rheumatic fever or streptococcal infection), evidence of aortic valve pathology (stenosis, regurgitation, or both), and concurrent tricuspid valve involvement of rheumatic origin.

• Aortic valve involvement: stenosis, insufficiency (regurgitation), or combined stenosis and insufficiency caused by rheumatic scarring
• Tricuspid valve involvement: stenosis, regurgitation, or combined disorder traceable to rheumatic disease
• Simultaneous bilateral presentation: both valves affected in the same patient encounter
• Rheumatic origin confirmed: etiology must be documented as rheumatic, not degenerative or congenital

Echocardiography, documented in a Doppler ultrasound report, is the imaging standard used to confirm rheumatic involvement of both valves before I08.2 is assigned.

Practices that manage cardiology patients benefit from structured patient records that capture comorbidities and etiology details, making it easier to support the clinical specificity ICD-10-CM requires for codes like I08.2.

I08.2 in the ICD-10-CM code hierarchy

Understanding where I08.2 sits in the ICD-10-CM structure helps coders navigate related codes and apply parent-level instructions correctly. The I08 category covers multiple valve diseases of rheumatic origin, and I08.2 is one of six subcodes.

Coding notes for I08.2: includes and excludes instructions

The official ICD-10-CM coding instructions attached to I08.2 carry direct reimbursement consequences. Misreading an Excludes1 as an Excludes2 leads to incorrect code pairing and potential claim rejection. The notes below reproduce CMS intent as published in the official tabular list.

Includes note (I08 category level)

The official Includes note at the I08 category level reads: multiple valve diseases specified as rheumatic or unspecified. This note is why unspecified multi-valve disease still falls into the rheumatic block.

If a physician documents combined aortic and tricuspid valve disease without explicitly ruling rheumatic origin in or out, I08.2 (or the appropriate I08 subcode) is still the correct category to consider. This differs from single-valve disease, where an unspecified etiology instead defaults to the nonrheumatic block (I34-I38).

Excludes1 note

Excludes1 means the listed condition cannot be coded at the same time as I08.2. These are mutually exclusive codes: the patient either has one or the other, never both simultaneously.

• Endocarditis, valve unspecified (I38)
• Rheumatic valve disease NOS (I09.1)

Excludes2 note

Excludes2 means the listed condition is not included in I08.2 but may be coded additionally if the patient has both. At the I08 category level, the official Excludes2 note covers multiple valve disease specified as nonrheumatic:

• Nonrheumatic valve disorders: I34.-, I35.-, I36.-, I37.-, I38.-
• Congenital valve malformations: Q22.-, Q23.-, Q24.8-

Rheumatic vs. non-rheumatic valve disease: coding distinction

This is where most multi-valve coding errors originate. ICD-10-CM separates valve disease by etiology into two distinct blocks, and the physician’s documentation must explicitly support whichever block the coder chooses.

Coders must not assume rheumatic origin based on the presence of valve disease alone. The World Health Organization (WHO) notes rheumatic heart disease is more prevalent in lower-resource settings, though it presents in all populations.

Only the physician can confirm rheumatic etiology in the documentation. Querying the physician when etiology is unclear is appropriate and required before assigning I08.2.

Rheumatic fever as the root cause: coding context

Rheumatic fever is an inflammatory complication of group A streptococcal pharyngitis. The acute inflammation resolves, but the structural damage to valve leaflets accumulates over years.

By the time a patient presents with clinically significant combined aortic and tricuspid valve disease, the original infection may have occurred decades earlier. That multi-decade interval is why longevity-focused practices, which track a patient’s health history over a lifetime rather than a single visit, are well placed to connect an old infection with a new valve finding.

This sequelae relationship is important for coding. ICD-10-CM treats the late effects of rheumatic fever as chronic rheumatic heart disease rather than requiring a separate sequelae code. Coders do not need to assign an additional “sequelae of rheumatic fever” code alongside I08.2 when the rheumatic etiology is documented.

The I08.2 code itself captures the chronic rheumatic state. This differs from some other sequelae coding situations, where a distinct late-effects code is required alongside the manifestation code.

Practices managing patients with chronic disease care pathways benefit from flagging rheumatic heart disease history in the patient record, so future encounters can correctly code recurrent or progressive valve complications without a fresh etiology query each time. As valve disease progresses, documenting goals of care with an advance care planning template becomes part of that same long-term record.

MS-DRG mapping for ICD-10 Code I08.2

When I08.2 is used as a principal or secondary inpatient diagnosis, it maps to specific Medicare Severity Diagnosis Related Groups (MS-DRGs). MS-DRG assignment determines inpatient reimbursement for Medicare patients, so accurate coding of I08.2 directly affects payment.

I08.2 typically maps into the valvular and other cardiac procedures MS-DRG groupings depending on whether a procedure is performed during the encounter. Without a procedure, the diagnosis maps into medical management DRGs for structural heart disease. With valve surgery, cardiac catheterization, or a procedure such as pacemaker insertion billed under 00534, the DRG shifts accordingly.

Verify current DRG numbers and relative weights against the CMS MS-DRG Definitions Manual for the applicable fiscal year. DRG assignments and weights change annually on October 1, and citing an outdated weight for a claim audit can create a reimbursement discrepancy. Using an EHR and billing system helps practices apply current DRG logic without maintaining manual crosswalk spreadsheets.

Documentation requirements for accurate I08.2 assignment

Assigning ICD-10 Code I08.2 requires the physician’s documentation to support three specific clinical elements. Missing any one of them shifts the correct code assignment and introduces audit risk.

• Rheumatic etiology confirmed: The note must state “rheumatic” explicitly, or document a history of rheumatic fever or prior streptococcal carditis. Degenerative valve disease, calcific changes, or congenital defects do not qualify for I08.2.
• Aortic valve involvement documented: The physician must describe the aortic valve pathology, including whether stenosis, insufficiency (regurgitation), or a combined disorder is present.
• Tricuspid valve involvement documented: Same requirement applies to the tricuspid valve. The nature of the tricuspid disorder (stenosis, insufficiency, or combined) must be specified.
• Concurrent presentation: Both valves must be documented as affected in the same clinical encounter. If the documentation discusses only one valve at the time of coding, review whether I06.x or I07.x (single-valve rheumatic codes) is more appropriate.

Coders using digital intake and forms that capture etiology fields alongside valve-specific assessments find the supporting documentation for I08.2 is easier to retrieve at coding time. For practices needing a documentation audit framework, the HIPAA-compliant record-keeping guidance applicable to cardiology records applies here as well.

Approximate synonyms and clinical terminology

These clinical descriptions are accepted synonyms for I08.2 in the ICD-10-CM index. Any of them in the physician’s documentation maps to this code during the coding lookup process.

• Rheumatic aortic and tricuspid valve disease
• Combined rheumatic aortic and tricuspid valve disorder
• Rheumatic disorder of aortic valve and tricuspid valve
• Rheumatic aortic tricuspid valvulopathy
• Rheumatic double valve disease (aortic and tricuspid)

Coders searching for these terms in a commercial lookup tool such as the ICD List should confirm the result maps to I08.2 before assigning. Synonym lookups sometimes surface broader I08 category codes like I08.9 (unspecified); always select the most specific code supported by documentation.

Practices managing coding across multiple specialties, from cardiology to primary care, benefit from a systematic code validation workflow rather than relying solely on memory or free-text lookups.

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Common coding errors to avoid with I08.2

Multi-valve rheumatic disease coding produces a predictable set of mistakes. Each error below has a direct reimbursement or compliance consequence.

• Using non-rheumatic codes when etiology is rheumatic: Assigning I35.x (non-rheumatic aortic) or I36.x (non-rheumatic tricuspid) when the physician documents rheumatic origin is an incorrect code assignment. Payers can identify this mismatch during an audit, especially when the patient’s history includes documented rheumatic fever.
• Assigning I08.9 (unspecified) instead of I08.2: When documentation clearly identifies both the aortic and tricuspid valves as affected by rheumatic disease, I08.2 is more specific than I08.9. Using the unspecified code when specificity is available violates ICD-10-CM coding guidelines and may reduce reimbursement.
• Selecting I08.3 instead of I08.2: I08.3 covers combined rheumatic disorders of three valves (mitral, aortic, and tricuspid). If the documentation confirms all three valves are affected, I08.3 is correct. If only the aortic and tricuspid are documented, I08.2 applies. Mixing these two based on clinical assumption rather than documentation is a common sequencing error.
• Ignoring Excludes1 conflicts: Assigning I38 (endocarditis, valve unspecified) or I09.1 (rheumatic valve disease NOS) alongside I08.2 in the same claim violates the Excludes1 note. These codes are mutually exclusive.

Cardiology coding teams that build structured practice management workflows around documentation checklists catch most of these errors at the point of care rather than at claims submission. The primary care EHR guidance also outlines documentation completeness checks applicable to cardiologists managing chronic rheumatic patients.

Conclusion

Rheumatic multi-valve disease coding hinges on one foundational requirement: confirmed rheumatic etiology in the physician’s documentation. Without it, ICD-10 Code I08.2 cannot be assigned, and using a non-rheumatic equivalent creates an audit trail that doesn’t match the clinical record.

Pabau’s claims management software supports cardiology and internal medicine practices with structured coding workflows, documentation capture, and billing integrations that reduce the manual overhead of keeping I08.x codes accurate. To see how Pabau handles multi-specialty clinical documentation and billing, book a demo.

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