Underdosing of other viral vaccines, subsequent encounter

This code signifies that a patient has received an insufficient amount of a viral vaccine other than the measles, mumps, and rubella (MMR) vaccine, and the encounter being coded is for follow-up care related to this underdosing. This could involve a patient who did not receive the full recommended dose or series of a viral vaccine, leading to potential incomplete immunity.

Use this code when documenting subsequent encounters for patients who previously received an inadequate dose of a viral vaccine (e.g., influenza, varicella, HPV, polio, hepatitis B) and are presenting for further evaluation, management, or completion of the vaccination series due to the initial underdosing. It is appropriate for situations where the underdosing is an ongoing concern or is being addressed in the current visit.

• Always sequence this code after the code(s) for the condition being vaccinated against, if applicable, or the reason for the encounter.
• Ensure documentation clearly specifies the viral vaccine involved and confirms the underdosing occurred.
• This "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase of the underdosing.