R49.2 ICD-10-CM Code: Hypernasality and hyponasality

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for R49.2 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on R49.2 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for R49.2

MedCoder structured workflow — derived from this code’s own official record

Before you code R49.2

1. R49.2 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewR49.21, R49.22

   See the relationships section · Guide: How to choose an ICD-10-CM code →

2. Check whether an established diagnosis that explains this sign or symptom is documented. If one is, review whether the documented diagnosis changes the coding pathway: a symptom that is integral to a confirmed diagnosis is not reported separately, while one not routinely associated with it may be. Signs and symptoms are reported when no definitive diagnosis is established (Guidelines I.B.4, I.B.5, I.B.6, I.C.18.b).

   Guide: Symptom code vs confirmed diagnosis →

3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with R49.2. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

   See the official tabular notes

Choose the right path

1. Does the documentation support one of the more specific codes beneath R49.2?
   Yes → Select that code and continue the checks below on its own page.
   No → R49.2 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewR49.21, R49.22

2. Is an established diagnosis that explains this sign or symptom documented?
   Yes → Review whether the documented diagnosis changes the coding pathway: a symptom integral to it is not reported separately.
   No → Continue — the sign or symptom code stands when no definitive diagnosis is established.
3. Does the documentation support a condition named in R49.2’s Excludes1 note?
   Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
   No → Continue.

   ReviewF44.4

Consider R49.2. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

• Excludes1 — check before selecting R49.2(1 note)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with R49.2: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareF44.4

  See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse R49.2 with…

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

The codes most likely to be picked instead of R49.2 — 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.

• F44.4— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of psychogenic voice and resonance disorders moves the case to F44.4; the two are not reported together unless documented as unrelated.

  Full comparison: R49.2 vs F44.4 →

• R49.9— 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 “Unspecified voice and resonance disorder” takes R49.9; specificity in the record moves it back here.

  Full comparison: R49.2 vs R49.9 →

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.

Verify Before Coding

• Not billable as written — a more specific code is required: R49.21, R49.22.

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

Contextual Map

Every relationship of R49.2 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.

Hierarchy

• R00-R99 — Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) (R00-R99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R47-R49 — Symptoms and signs involving speech and voice[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Nearest codes

• R49 — Voice and resonance disorders[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.0 — Dysphonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.1 — Aphonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.21 — Hypernasality[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.22 — Hyponasality[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.8 — Other voice and resonance disorders[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R49.9 — Unspecified voice and resonance disorder[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

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

Common coding questions

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) 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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to R49.2 in its code family, with their registry titles.

• R49 — Voice and resonance disorders
• R49.0 — Dysphonia
• R49.1 — Aphonia
• R49.21 — Hypernasality
• R49.22 — Hyponasality
• R49.8 — Other voice and resonance disorders
• R49.9 — Unspecified voice and resonance disorder

View all codes in the R49 family