Thrombocytosis, unspecified

This code signifies an elevated platelet count in the blood, where the specific underlying cause of the thrombocytosis has not been determined or documented. It indicates a quantitative abnormality of platelets without further etiological specification.

This code is appropriate when the medical record documents thrombocytosis but lacks information to classify it as essential (primary) or secondary. It should be used when the physician has not specified the type of thrombocytosis, or when further investigation is pending.

• Do not use this code if the documentation specifies primary (essential) thrombocythemia (D47.3) or secondary thrombocytosis due to a known cause.
• Always query the provider for clarification if the type of thrombocytosis is not documented, to allow for more specific coding.
• This code should be assigned as a principal or secondary diagnosis based on the clinical circumstances and the reason for the encounter.