Corpus luteum cyst of ovary, unspecified side

This code describes a benign, fluid-filled sac that forms on the ovary after an egg has been released from the follicle during ovulation. It is a common and usually harmless physiological cyst that typically resolves spontaneously. The "unspecified side" indicates that the laterality of the cyst (left or right ovary) is not documented.

Use this code when documentation confirms the presence of a corpus luteum cyst but does not specify whether it is on the left or right ovary. This is often an incidental finding during imaging or a physical exam. Supporting documentation would include imaging reports (e.g., ultrasound) or physician notes describing the cyst without laterality.

• Avoid using this code if laterality (left or right ovary) is clearly documented; instead, use the more specific codes N83.11 (right) or N83.12 (left).
• Do not confuse this with other ovarian cyst types, such as follicular cysts (N83.0-) or other specified ovarian cysts (N83.29-).
• This code is typically a secondary diagnosis unless the cyst is causing symptoms or is the primary reason for the encounter.