ICD-10 R50.9
Billable / SpecificFever, unspecified
About ICD-10-CM R50.9
ICD-10-CM code R50.9 represents Fever, unspecified. This is a billable/specific code in the Symptoms, Signs, and Abnormal Findings chapter (block R50). The 2026 edition of ICD-10-CM R50.9 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under R50.9. Per CMS ICD-10-CM Tabular 2026.
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
Medicare LCD Coverage for R50.9
Local Coverage Determinations (LCDs) from CMS MACs that list R50.9 as a covered diagnosis.
Showing top 10 of 721 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing R50.9.
2 Cigna
5 Medicare
4 Aetna
CPT Codes Commonly Billed with R50.9
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
- 99212 Established patient — URI, UTI, pharyngitis, otitis, dermatitis, rash, viral infection, cellulitis, conjunctivitis, sinusitis, bronchitis, ankle sprain Primary Care
- 85025 CBC with differential — anemia, iron deficiency, fatigue, thrombocytopenia, neutropenia, leukemia, lymphoma, abnormal labs, routine exam, screening, fever, elevated WBC Laboratory
- 81001 Urinalysis with microscopy — UTI, cystitis, dysuria, urinary frequency, abnormal urine, pyelonephritis, chronic pyelonephritis, fever, kidney stone Laboratory
- 99281 ED visit level 1 — fever, cough, URI, abdominal pain, dizziness, laceration, ankle sprain, nausea, minor injury Emergency Medicine
- 99282 ED visit level 2 — same as level 1 with low complexity MDM Emergency Medicine
Convert R50.9 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 |
|---|---|---|
| R50.9 | 78060 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To R50.9
Other codes in section R50-R69 (General symptoms and signs).
ICD-10 R50.9, Billing FAQ
Is ICD-10 code R50.9 billable? +
Yes, R50.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to R50.9? +
ICD-10 R50.9 includes: Fever NOS; Fever of unknown origin [FUO]; Fever with chills, and 4 more clinical synonyms.
What CPT codes are commonly billed with R50.9? +
Procedures frequently paired with R50.9 include: 99202, 99203, 99212, 85025, 81001.
What ICD-9 codes does R50.9 map to? +
Per CMS GEMs, R50.9 maps to ICD-9 codes: 78060. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team