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pyrexia NOS (O86.4)
- R50.2 Drug induced fever
- Code first (T36-T50) to identify drug
- Excludes1: postvaccination (postimmunization) fever (R50.83)
- R50.8 Other specified fever
- R50.81 Fever presenting with conditions classified elsewhere
- Code first underlying condition when associated fever is present, such as with:
- leukemia (C91-C95)
- neutropenia (D70.-)
- sickle cell disease (D57.-)
- Code first underlying condition when associated fever is present, such as with:
- R50.82 Postprocedural fever
- Excludes1: postprocedural infection (T81.4)
- postvaccination (postimmunization) fever (R50.83)
- Excludes1: postprocedural infection (T81.4)
- R50.83 Postvaccination fever
- Postimmunization fever
- R50.81 Fever presenting with conditions classified elsewhere
- R50.9 Fever, unspecified
- Fever NOS
- Fever of unknown origin [FUO]
- Fever with chills
- Fever with rigors
- Hyperpyrexia NOS
- Persistent fever
- Pyrexia NOS
R51 Headache
- Includes: facial pain NOS
- Excludes1: atypical face pain (G50.1)
- migraine and other headache syndromes (G43-G44)
- trigeminal neuralgia (G50.0)
R52 Pain, unspecified
- Acute pain NOS
- Chronic pain NOS
- Generalized pain NOS
- Pain NOS
- Excludes1: acute and chronic pain, not elsewhere classified (G89.-)
- localized pain, unspecified type - code to pain by site, such as:
- abdomen pain (R10.-)
- back pain (M54.9)
- breast pain (N64.4)
- chest pain (R07.1-R07.9)
- ear pain (H92.0-)
- eye pain (H57.1)
- headache (R51)
- joint
