Non-Billable / Non-Specific Code
ICD-10-CM I99 is the diagnosis code for Other and unspecified disorders of circulatory system. This code falls under the section "Other and unspecified disorders of the circulatory system" within Chapter 9 — Diseases of the circulatory system (I00-I99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where I99 sits in the ICD-10-CM classification helps ensure proper coding:
No, I99 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
I99 is the ICD-10-CM diagnosis code for "Other and unspecified disorders of circulatory system". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
I99 is located in Section I95-I99 — "Other and unspecified disorders of the circulatory system" within Chapter 9 of the ICD-10-CM Tabular List.
I99 has 2 sub-code(s) that provide more specific detail: I99.8, I99.9.
Use I99 when the patients documented diagnosis matches "Other and unspecified disorders of circulatory system" 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 Other and unspecified disorders of circulatory system is I99.
No, I99 is non-billable. Use a more specific sub-code for primary diagnosis billing.
I99 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I99 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.