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P29.1 vs Q28

P29.1 (Neonatal cardiac dysrhythmia) compared with Q28 (Other congenital malformations of circulatory system), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because P29.1 lists Q28 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.P29.1 is “Neonatal cardiac dysrhythmia”; Q28 is “Other congenital malformations of circulatory system”. P29.1 sits in P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96); Q28 in Q00-QA1 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-QA1).

Registry fact

Can these codes be reported together?

Yes, when both are documented.P29.1 lists Q28 under Excludes2: “congenital malformations of the circulatory system (Q20-Q28)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. Q28 carries 4 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.P29.1’s tabular entry: “congenital malformations of the circulatory system (Q20-Q28)”. The note covers Q28.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

P29.1
Neonatal cardiac dysrhythmia
↔
Q28
Other congenital malformations of circulatory system

What we found

Yes, when both are documented.P29.1 carries an Excludes2 note covering Q28: “congenital malformations of the circulatory system (Q20-Q28)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
P29.1

Neonatal cardiac dysrhythmia

Q28

Other congenital malformations of circulatory system

StatusDiffers
P29.1
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: P29.11, P29.12

Q28
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: Q28.0, Q28.1, Q28.2, Q28.3, Q28.8

Excludes1Differs
P29.1

None at this code

Q28
  • congenital aneurysm NOS (Q27.8)
  • congenital coronary aneurysm (Q24.5)
  • ruptured cerebral arteriovenous malformation (I60.8)
  • ruptured malformation of precerebral vessels (I72.0)
Excludes2Differs
P29.1
  • congenital malformations of the circulatory system (Q20-Q28)
Q28
  • congenital peripheral aneurysm (Q27.8)
  • congenital pulmonary aneurysm (Q25.79)
  • congenital retinal aneurysm (Q14.1)
CategoryDiffers
P29.1

P29 Cardiovascular disorders originating in the perinatal period

Q28

Is itself a category

ChapterDiffers
P29.1

P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)

Q28

Q00-QA1 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-QA1)

No Code first, Use additional code, Code also, Includes and 7th character note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources