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I27.1 ICD-10-CM Code: Kyphoscoliotic heart disease

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 85 · RxHCC V08 category 184

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 314 — OTHER CIRCULATORY SYSTEM DIAGNOSES WITH MCC (MDC 05)
  • MS-DRG 315 — OTHER CIRCULATORY SYSTEM DIAGNOSES WITH CC (MDC 05)
  • MS-DRG 316 — OTHER CIRCULATORY SYSTEM DIAGNOSES WITHOUT CC/MCC (MDC 05)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 226 — Heart Failure, Except End-Stage and Acute (supersedes HCC 227)

Other models: CMS-HCC V22 HCC 85 · RxHCC V08 HCC 184

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Don’t confuse I27.1 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of I27.1 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • I27.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Pulmonary heart disease, unspecified” takes I27.9; specificity in the record moves it back here.

    Full comparison: I27.1 vs I27.9 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Code Overview

Kyphoscoliotic heart disease is a billable ICD-10-CM diagnosis code (I27.1).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 9: Diseases of the Circulatory System (I00 -I99)

11) Pulmonary Hypertension Pulmonary hypertension is classified to category I27, Other pulmonary heart diseases. For secondary pulmonary hypertension (I27.1, I27.2-), code also any associated conditions or adverse effects of drugs or toxins. The sequencing is based on the reason for the encounter, except for adverse effects of drugs (See Section I.C.19.e.).

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name I27.1 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: M41 — Scoliosis.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 13 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 314 (MDC 05), DRG 315 (MDC 05), DRG 316 (MDC 05).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):CIR014 — Pulmonary heart disease (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

E66.2 — Morbid (severe) obesity with alveolar hypoventilation, I27.0 — Primary pulmonary hypertension, I27.20 — Pulmonary hypertension, unspecified, I27.21 — Secondary pulmonary arterial hypertension, I27.22 — Pulmonary hypertension due to left heart disease, I27.23 — Pulmonary hypertension due to lung diseases and hypoxia, I27.24 — Chronic thromboembolic pulmonary hypertension, I27.29 — Other secondary pulmonary hypertension, I27.81 — Cor pulmonale (chronic), I27.83 — Eisenmenger's syndrome, I27.89 — Other specified pulmonary heart diseases, I27.9 — Pulmonary heart disease, unspecified

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Heart Failure, Except End-Stage and Acute) for risk-adjusted payment.

I09.81 — Rheumatic heart failure, I11.0 — Hypertensive heart disease with heart failure, I13.0 — Hypertensive heart and chronic kidney disease with heart failure and stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease, I13.2 — Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease, I27.0 — Primary pulmonary hypertension, I27.20 — Pulmonary hypertension, unspecified, I27.21 — Secondary pulmonary arterial hypertension, I27.22 — Pulmonary hypertension due to left heart disease, I27.23 — Pulmonary hypertension due to lung diseases and hypoxia, I27.24 — Chronic thromboembolic pulmonary hypertension, I27.29 — Other secondary pulmonary hypertension, I27.81 — Cor pulmonale (chronic), I27.83 — Eisenmenger's syndrome, I27.89 — Other specified pulmonary heart diseases, I27.9 — Pulmonary heart disease, unspecified, I28.0 — Arteriovenous fistula of pulmonary vessels, I28.1 — Aneurysm of pulmonary artery, I28.8 — Other diseases of pulmonary vessels, I28.9 — Disease of pulmonary vessels, unspecified, I50.1 — Left ventricular failure, unspecified, +13 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Heart Failure with Heart Assist Device/Artificial Heart, Acute on Chronic Heart Failure, Acute Heart Failure (Excludes Acute on Chronic), Cardiomyopathy/Myocarditis

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Pulmonary heart disease).

I27.0 — Primary pulmonary hypertension, I27.2 — Other secondary pulmonary hypertension, I27.20 — Pulmonary hypertension, unspecified, I27.21 — Secondary pulmonary arterial hypertension, I27.22 — Pulmonary hypertension due to left heart disease, I27.23 — Pulmonary hypertension due to lung diseases and hypoxia, I27.24 — Chronic thromboembolic pulmonary hypertension, I27.29 — Other secondary pulmonary hypertension, I27.81 — Cor pulmonale (chronic), I27.82 — Chronic pulmonary embolism, I27.83 — Eisenmenger's syndrome, I27.840 — Fontan-associated liver disease [FALD], I27.841 — Fontan-associated lymphatic dysfunction, I27.848 — Other Fontan-associated condition, I27.849 — Fontan related circulation, unspecified, I27.89 — Other specified pulmonary heart diseases, I27.9 — Pulmonary heart disease, unspecified, I28.0 — Arteriovenous fistula of pulmonary vessels, I28.1 — Aneurysm of pulmonary artery, I28.8 — Other diseases of pulmonary vessels, +1 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Hypertension, hypertensive”, “Kyphoscoliosis, kyphoscoliotic”; these codes share that main term but sit in a different category of the Tabular List.

I15.0 — Renovascular hypertension (renovascular), I15.1 — Hypertension secondary to other renal disorders (due to, renal disorders NEC), I15.2 — Hypertension secondary to endocrine disorders (due to, pheochromocytoma), I15.8 — Other secondary hypertension (secondary NEC, specified NEC), I15.9 — Secondary hypertension, unspecified (secondary NEC), I16.0 — Hypertensive urgency (urgency), I16.1 — Hypertensive emergency (emergency), I16.9 — Hypertensive crisis, unspecified (crisis), I1A.0 — Resistant hypertension (resistant), I26.09 — Other pulmonary embolism with acute cor pulmonale (pulmonary, with, cor pulmonale, acute), I67.4 — Hypertensive encephalopathy (encephalopathy), I70.1 — Atherosclerosis of renal artery (Goldblatt's), I87.30 — Chronic venous hypertension (idiopathic) without complications (venous, idiopathic, asymptomatic), I87.309 — Chronic venous hypertension (idiopathic) without complications of unspecified lower extremity (venous, idiopathic), I87.31 — Chronic venous hypertension (idiopathic) with ulcer (venous, idiopathic, with, ulcer), I87.32 — Chronic venous hypertension (idiopathic) with inflammation (venous, idiopathic, with, inflammation), I87.33 — Chronic venous hypertension (idiopathic) with ulcer and inflammation (venous, idiopathic, with, inflammation, with ulcer), I87.39 — Chronic venous hypertension (idiopathic) with other complications (venous, idiopathic, with, specified complication NEC), I97.3 — Postprocedural hypertension (postoperative), K31.89 — Other diseases of stomach and duodenum (portal, gastropathy), +50 more

Contextual Map

Every relationship of I27.1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run I27.1 with this related code in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • M41 — Scoliosis[Excludes1]: “kyphoscoliotic heart disease (I27.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 226 — Heart Failure, Except End-Stage and Acute [CMS-HCC]: “Heart Failure, Except End-Stage and Acute — supersedes HCC 227 (Cardiomyopathy/Myocarditis)”— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 05 — Diseases and Disorders of the Circulatory System[MDC crossing]: “Diseases and Disorders of the Circulatory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 15,708 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Disease, diseased, heart (organic), kyphoscoliotic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic), pulmonary, due to, kyphoscoliotic heart disease[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Kyphoscoliosis, kyphoscoliotic (acquired), heart (disease)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (20)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "I27.1 — Kyphoscoliotic heart disease." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/i27.1-kyphoscoliotic-heart-disease

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Kyphoscoliotic heart disease

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I27.1 in its code family, with their registry titles.

View all codes in the I27 family