Other disorders of blood and blood-forming organs in diseases classified elsewhere (D77)
The ICD-10 code D77 is used to classify various blood and blood-forming organ disorders that arise due to other underlying diseases. This code captures conditions that don’t have a primary blood disorder diagnosis but result from different illnesses affecting the blood.
This section includes disorders like secondary cytopenia (a reduction in blood cell counts caused by another disease), lymphoid system findings, hyperreactive malarial splenomegaly syndrome (an abnormal spleen enlargement linked to malaria), and autoimmune reactions triggered by infectious diseases. Medical coders looking for the ICD-10 code for autoimmune blood reactions or related secondary hematologic conditions will find D77 applies when blood problems are not primary but connected to another illness. This differentiation helps ensure accurate documentation and supports appropriate treatment planning for complex cases involving blood abnormalities tied to other diseases.
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50–D89)
Other disorders of blood and blood-forming organs (D70-D77)
- D77 Other disorders of blood and blood-forming organs in diseases classified elsewhere
Other disorders of blood and blood-forming organs in diseases classified elsewhere (D77)
Instructional Notations
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- underlying disease, such as:
- amyloidosis E85
- congenital early syphilis A50.0
- echinococcosis B67.0 B67.9
- malaria B50.0 B54
- schistosomiasis [bilharziasis] B65.0 B65.9
- vitamin C deficiency E54
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
