ICD-10 R63.4
Billable / SpecificAbnormal weight loss
About ICD-10-CM R63.4
ICD-10-CM code R63.4 represents Abnormal weight loss. This is a billable/specific code in the Symptoms, Signs, and Abnormal Findings chapter (block R63). The 2026 edition of ICD-10-CM R63.4 became effective on October 1, 2025.
Medicare LCD Coverage for R63.4
Local Coverage Determinations (LCDs) from CMS MACs that list R63.4 as a covered diagnosis.
Showing top 10 of 246 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing R63.4.
5 Medicare
2 Aetna
CPT Codes Commonly Billed with R63.4
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 99202 New patient office visit — fever, headache, abdominal pain, cough, dyspnea, fatigue, dizziness, limb pain, nausea, routine exam, URI, UTI, pharyngitis, otitis, chest pain, weight loss Primary Care
- 99203 New patient office visit — common complaints plus chronic conditions: HTN, diabetes, hyperlipidemia, asthma, GERD, back pain, migraine, tachycardia, prediabetes Primary Care
- 99204 New patient office visit — multiple chronic conditions: HTN, T2DM, hyperlipidemia, asthma, anxiety, depression, obesity, IBS, COPD, thyroid, anemia, CAD, sleep apnea, psoriasis, RA Primary Care
- 43235 Diagnostic EGD — abdominal pain, nausea, vomiting, GERD, gastric ulcer, gastritis, hematemesis, melena, Barrett esophagus, dysphagia, esophagitis, weight loss, iron deficiency anemia, polyp Gastroenterology
- 45378 Diagnostic colonoscopy — colorectal screening, family hx colon cancer, polyp, melena, iron def anemia, diverticulosis, ulcerative colitis, Crohn, occult blood, rectal polyp, weight loss, IBS Gastroenterology
- 84443 TSH — hypothyroidism, hyperthyroidism, thyroiditis, weight loss, weight gain, post-surgical hypothyroidism, fatigue, routine exam, screening Laboratory
Convert R63.4 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| R63.4 | 78321 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To R63.4
Other codes in section R50-R69 (General symptoms and signs).
ICD-10 R63.4, Billing FAQ
Is ICD-10 code R63.4 billable? +
Yes, R63.4 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with R63.4? +
Procedures frequently paired with R63.4 include: 99202, 99203, 99204, 43235, 45378.
What ICD-9 codes does R63.4 map to? +
Per CMS GEMs, R63.4 maps to ICD-9 codes: 78321. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 17, 2026.
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