| R00 | Abnormalities of heart beat |
| R00.0 | Tachycardia, unspecified |
| R00.1 | Bradycardia, unspecified |
| R00.2 | Palpitations |
| R00.8 | Other abnormalities of heart beat |
| R00.9 | Unspecified abnormalities of heart beat |
| R01 | Cardiac murmurs and other cardiac sounds |
| R01.0 | Benign and innocent cardiac murmurs |
| R01.1 | Cardiac murmur, unspecified |
| R01.2 | Other cardiac sounds |
| R03 | Abnormal blood-pressure reading, without diagnosis |
| R03.0 | Elevated blood-pressure reading, without diagnosis of hypertension |
| R03.1 | Nonspecific low blood-pressure reading |
| R04 | Hemorrhage from respiratory passages |
| R04.0 | Epistaxis |
| R04.1 | Hemorrhage from throat |
| R04.2 | Hemoptysis |
| R04.8 | Hemorrhage from other sites in respiratory passages |
| R04.81 | Acute idiopathic pulmonary hemorrhage in infants |
| R04.89 | Hemorrhage from other sites in respiratory passages |
| R04.9 | Hemorrhage from respiratory passages, unspecified |
| R05 | Cough |
| R06 | Abnormalities of breathing |
| R06.0 | Dyspnea |
| R06.00 | Dyspnea, unspecified |
| R06.01 | Orthopnea |
| R06.02 | Shortness of breath |
| R06.09 | Other forms of dyspnea |
| R06.1 | Stridor |
| R06.2 | Wheezing |
| R06.3 | Periodic breathing |
| R06.4 | Hyperventilation |
| R06.5 | Mouth breathing |
| R06.6 | Hiccough |
| R06.7 | Sneezing |
| R06.8 | Other abnormalities of breathing |
| R06.81 | Apnea, not elsewhere classified |
| R06.82 | Tachypnea, not elsewhere classified |
| R06.83 | Snoring |
| R06.89 | Other abnormalities of breathing |
| R06.9 | Unspecified abnormalities of breathing |
| R07 | Pain in throat and chest |
| R07.0 | Pain in throat |
| 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 |