ICD-10-CM
ICD-10 code for Monocytosis: D72.821
The closest CDC title for "Monocytosis" is D72.821, Monocytosis (symptomatic). D72.821 is a billable code.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under D72, then other CDC titles that name monocytosis (symptomatic)
A header groups codes and is not billed. A billable code is one you can report. Listed second marks a billable manifestation code (its CDC title says it is "classified elsewhere"): code the underlying disease or condition first, then this code.
- D72Other disorders of white blood cellsHeader
- D72.0Genetic anomalies of leukocytesBillable
- D72.1EosinophiliaHeader
- D72.10Eosinophilia, unspecifiedBillable
- D72.11Hypereosinophilic syndrome [HES]Header
- D72.110Idiopathic hypereosinophilic syndrome [IHES]Billable
- D72.111Lymphocytic Variant Hypereosinophilic Syndrome [LHES]Billable
- D72.118Other hypereosinophilic syndromeBillable
- D72.119Hypereosinophilic syndrome [HES], unspecifiedBillable
- D72.12Drug rash with eosinophilia and systemic symptoms syndromeBillable
- D72.18Eosinophilia in diseases classified elsewhereListed second
- D72.19Other eosinophiliaBillable
- D72.8Other specified disorders of white blood cellsHeader
- D72.81Decreased white blood cell countHeader
- D72.810LymphocytopeniaBillable
- D72.818Other decreased white blood cell countBillable
- D72.819Decreased white blood cell count, unspecifiedBillable
- D72.82Elevated white blood cell countHeader
- D72.820Lymphocytosis (symptomatic)Billable
- D72.821Monocytosis (symptomatic)Billable
- D72.822PlasmacytosisBillable
- D72.823Leukemoid reactionBillable
- D72.824BasophiliaBillable
- D72.825BandemiaBillable
- D72.828Other elevated white blood cell countBillable
- D72.829Elevated white blood cell count, unspecifiedBillable
- D72.89Other specified disorders of white blood cellsBillable
- D72.9Disorder of white blood cells, unspecifiedBillable
Excludes1
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From D72. A note on a category applies to every code under it.
Related conditions
Related pages
- D72.821 code detailsNotes, nearby codes, CMS-HCC group
- Category D72Every code under it
- Chapter 3Diseases of the blood and blood-forming organs
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Monocytosis?
The closest CDC title for "Monocytosis" is D72.821, Monocytosis (symptomatic). D72.821 is a billable code.
Is D72.821 billable?
Yes. D72.821 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to D72.821?
The CDC tabular list gives 6 Excludes1 notes (not coded together), 1 Excludes2 note (may be coded together when both are documented) for D72.821 and the categories above it. They are listed on this page.
What chapter is D72.821 in?
Chapter 3. Diseases of the blood and blood-forming organs.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.