Chapter 18

R00–R99: Symptoms, Signs and Abnormal Clinical and Laboratory Findings

Symptoms, Signs and Abnormal Clinical and Laboratory Findings diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)

abnormal findings on antenatal screening of mother (O28.-)
certain conditions originating in the perinatal period (P04-P96)
signs and symptoms classified in the body system chapters
signs and symptoms of breast (N63, N64.5)

All Codes Billable Only

Internal Codes

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R07.1|
Chest pain on breathing
R07.2|
Precordial pain
R07.8|
Other chest pain
R07.81|
Pleurodynia
R07.82|
Intercostal pain
R07.89|
Other chest pain
R07.9|
Chest pain, unspecified
R09|
Other symptoms and signs involving the circulatory and respiratory system
R09.0|
Asphyxia and hypoxemia
R09.01|
Asphyxia
R09.02|
Hypoxemia
R09.1|
Pleurisy
R09.2|
Respiratory arrest
R09.3|
Abnormal sputum
R09.8|
Other specified symptoms and signs involving the circulatory and respiratory systems
R09.81|
Nasal congestion
R09.82|
Postnasal drip
R09.89|
Other specified symptoms and signs involving the circulatory and respiratory systems
R09.A|
Foreign body sensation of the circulatory and respiratory system
R09.A0|
Foreign body sensation, unspecified
R09.A1|
Foreign body sensation, nose
R09.A2|
Foreign body sensation, throat
R09.A9|
Foreign body sensation, other site
R10|
Abdominal and pelvic pain
R10.0|
Acute abdomen
R10.1|
Pain localized to upper abdomen
R10.10|
Upper abdominal pain, unspecified
R10.11|
Right upper quadrant pain
R10.12|
Left upper quadrant pain
R10.13|
Epigastric pain
R10.2|
Pelvic and perineal pain
R10.20|
Pelvic and perineal pain unspecified side
R10.21|
Pelvic and perineal pain right side
R10.22|
Pelvic and perineal pain left side
R10.23|
Pelvic and perineal pain bilateral
R10.24|
Suprapubic pain
R10.3|
Pain localized to other parts of lower abdomen
R10.30|
Lower abdominal pain, unspecified
R10.31|
Right lower quadrant pain
R10.32|
Left lower quadrant pain
R10.33|
Periumbilical pain
R10.8|
Other abdominal pain
R10.81|
Abdominal tenderness
R10.811|
Right upper quadrant abdominal tenderness
R10.812|
Left upper quadrant abdominal tenderness
R10.813|
Right lower quadrant abdominal tenderness
R10.814|
Left lower quadrant abdominal tenderness
R10.815|
Periumbilic abdominal tenderness
R10.816|
Epigastric abdominal tenderness
R10.817|
Generalized abdominal tenderness

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