ICD-10-CM D72.821 is the diagnosis code for Monocytosis (symptomatic). This code falls under the section "Other disorders of blood and blood-forming organs" within Chapter 3 — Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89). 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 D72.821. They are mutually exclusive:
Understanding where D72.821 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, D72.821 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
D72.821 is the ICD-10-CM diagnosis code for "Monocytosis (symptomatic)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of D72.821 is D72.82 ("Elevated white blood cell count"). D72.821 provides a more specific classification within this category.
D72.821 is located in Section D70-D77 — "Other disorders of blood and blood-forming organs" within Chapter 3 of the ICD-10-CM Tabular List.
Use D72.821 when the patients documented diagnosis matches "Monocytosis (symptomatic)" 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 Monocytosis (symptomatic) is D72.821.
Yes, D72.821 can be used as a primary diagnosis code since it is billable and specific.
D72.821 is in Chapter 3 of the ICD-10-CM Tabular List.
Type 1 Excludes for D72.821 include: infectious mononucleosis (B27.-).
Yes, D72.821 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.