ICD-10-CM Y99.1 is the diagnosis code for Military activity. This code falls under the section "Supplementary factors related to causes of morbidity classified elsewhere" within Chapter 20 — External causes of morbidity (V00-Y99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as Y99.1. They are mutually exclusive:
Understanding where Y99.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Y99.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Y99.1 is the ICD-10-CM diagnosis code for "Military activity". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Y99.1 is Y99 ("External cause status"). Y99.1 provides a more specific classification within this category.
Y99.1 is located in Section Y90-Y99 — "Supplementary factors related to causes of morbidity classified elsewhere" within Chapter 20 of the ICD-10-CM Tabular List.
Use Y99.1 when the patients documented diagnosis matches "Military activity" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Military activity is Y99.1.
Yes, Y99.1 can be used as a primary diagnosis code since it is billable and specific.
Y99.1 is in Chapter 20 of the ICD-10-CM Tabular List.
Type 1 Excludes for Y99.1 include: activity of off duty military personnel (Y99.8).
Yes, Y99.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.