R63.0 ICD-10-CM Code: Anorexia

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for R63.0 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 R63.0 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for R63.0

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

Before you code R63.0

1. 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 →

2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with R63.0. 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. 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.
2. Does the documentation support a condition named in R63.0’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.

   ReviewF50.0, F50.89, F50.2

Consider R63.0. 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 R63.0(3 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with R63.0: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareF50.0, F50.89, F50.2

  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.

Indexed Clinical Terms (5)

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.

• Anorexia
• Appetite, lack or loss
• Dysorexia
• Lack of, appetite (see Anorexia)
• Loss (of), appetite (see Anorexia)

Don’t confuse R63.0 with…

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

The codes most likely to be picked instead of R63.0 — 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.

• F50.0— 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 anorexia nervosa moves the case to F50.0; the two are not reported together unless documented as unrelated.

  Full comparison: R63.0 vs F50.0 →

• F50.89— 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 loss of appetite of nonorganic origin moves the case to F50.89; the two are not reported together unless documented as unrelated.

  Full comparison: R63.0 vs F50.89 →

• F50.2— 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 bulimia NOS moves the case to F50.2; the two are not reported together unless documented as unrelated.

  Full comparison: R63.0 vs F50.2 →

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

• No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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 R63.0 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 2 Excludes1 notes: F50 — Eating disorders, F50.0 — Anorexia nervosa.

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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 640 (MDC 10), DRG 641 (MDC 10).

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

Clinical classification (AHRQ CCSR):SYM016 — Other general signs and symptoms (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 category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other general signs and symptoms).

R60.0 — Localized edema, R60.1 — Generalized edema, R60.9 — Edema, unspecified, R61 — Generalized hyperhidrosis, R62.0 — Delayed milestone in childhood, R62.50 — Unspecified lack of expected normal physiological development in childhood, R62.51 — Failure to thrive (child), R62.52 — Short stature (child), R62.59 — Other lack of expected normal physiological development in childhood, R62.7 — Adult failure to thrive, R63.1 — Polydipsia, R63.2 — Polyphagia, R63.3 — Feeding difficulties, R63.30 — Feeding difficulties, unspecified, R63.31 — Pediatric feeding disorder, acute, R63.32 — Pediatric feeding disorder, chronic, R63.39 — Other feeding difficulties, R63.4 — Abnormal weight loss, R63.5 — Abnormal weight gain, R63.6 — Underweight, +38 more

Same Index main term, other category

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

R29.890 — Loss of height (height), R41.9 — Unspecified symptoms and signs involving cognitive functions and awareness (awareness), R44.9 — Unspecified symptoms and signs involving general sensations and perceptions (sensory), R53.83 — Other fatigue (energy), R55 — Syncope and collapse (consciousness, transient), R62.50 — Unspecified lack of expected normal physiological development in childhood (development), R62.51 — Failure to thrive (child) (development, failure to thrive), R62.52 — Short stature (child) (growth), R62.59 — Other lack of expected normal physiological development in childhood (development, specified type NEC), R62.7 — Adult failure to thrive (development, failure to thrive, adult), T73.1 — Deprivation of water (water), T74.02 — Child neglect or abandonment, confirmed (care, of infant, confirmed), T76.02 — Child neglect or abandonment, suspected (care, of infant), Z55.3 — Underachievement in school (achievement in school), Z58.6 — Inadequate drinking-water supply (safe drinking water), Z58.81 — Basic services unavailable in physical environment (basic services in physical environment), Z59.00 — Homelessness unspecified (housing), Z59.02 — Unsheltered homelessness (shelter), Z59.10 — Inadequate housing, unspecified (housing, adequate), Z59.11 — Inadequate housing environmental temperature (heating), +61 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Fecal Occult Blood Test (FOBT), Hepatitis Testing, Thyroid Stimulating Hormone (TSH)

Contextual Map

Every relationship of R63.0 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 R63.0 with these 3 related codes in Claim Check

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
• R50-R69 — General symptoms and signs[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Excludes1

• F50.0 — Anorexia nervosa[Excludes1]: “anorexia nervosa (F50.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• F50.89 — Other specified eating disorder[Excludes1]: “loss of appetite of nonorganic origin (F50.89)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes1 notes

• F50 — Eating disorders[Excludes1]: “anorexia NOS (R63.0)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• F50.0 — Anorexia nervosa[Excludes1]: “loss of appetite (R63.0)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• SYM016 — Other general signs and symptoms[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• DRG 640 — MISCELLANEOUS DISORDERS OF NUTRITION, METABOLISM, FLUIDS AND ELECTROLYTES WITH MCC[MS-DRG]: “MISCELLANEOUS DISORDERS OF NUTRITION, METABOLISM, FLUIDS AND ELECTROLYTES WITH MCC (MDC 10)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 641 — MISCELLANEOUS DISORDERS OF NUTRITION, METABOLISM, FLUIDS AND ELECTROLYTES WITHOUT MCC[MS-DRG]: “MISCELLANEOUS DISORDERS OF NUTRITION, METABOLISM, FLUIDS AND ELECTROLYTES WITHOUT MCC (MDC 10)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 10 — Endocrine, Nutritional and Metabolic Diseases and Disorders[MDC crossing]: “Endocrine, Nutritional and Metabolic Diseases and Disorders — 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. 5,008 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Anorexia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Appetite, lack or loss[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Dysorexia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Lack of, appetite (see Anorexia)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Loss (of), appetite (see Anorexia)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (12)

• R63 — Symptoms and signs concerning food and fluid intake[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.1 — Polydipsia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.2 — Polyphagia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.3 — Feeding difficulties[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.30 — Feeding difficulties, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.31 — Pediatric feeding disorder, acute[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.32 — Pediatric feeding disorder, chronic[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• R63.39 — Other feeding difficulties[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 4 more

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 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

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 — v43 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 R63.0 in its code family, with their registry titles.

• R63 — Symptoms and signs concerning food and fluid intake
• R63.1 — Polydipsia
• R63.2 — Polyphagia
• R63.3 — Feeding difficulties
• R63.30 — Feeding difficulties, unspecified
• R63.31 — Pediatric feeding disorder, acute
• R63.32 — Pediatric feeding disorder, chronic
• R63.39 — Other feeding difficulties
• R63.4 — Abnormal weight loss
• R63.5 — Abnormal weight gain

View all codes in the R63 family