Tetany

This code represents a state of sustained muscle contraction due to hyperexcitability of nerves and muscles, often characterized by carpopedal spasms, muscle cramps, and paresthesias. It is a symptom, not a definitive diagnosis, indicating an underlying electrolyte imbalance or other physiological disturbance.

Assign this code when documentation explicitly states "tetany" without further specification of its cause. This is appropriate for cases where the etiology is unknown or not yet determined, such as in emergency department presentations or initial workups. Supporting documentation would include physician notes describing the characteristic muscle spasms or paresthesias.

• Do not code this if a more specific cause of tetany is identified and documented (e.g., hypocalcemic tetany).
• Review the "Excludes1" notes carefully to avoid inappropriate co-coding with conditions like hysterical tetany or parathyroid tetany.
• This code should often be sequenced as a secondary diagnosis, with the underlying cause coded as the primary diagnosis once identified.