ICD-10 Code for Decrease

The ICD-10-CM 2027 alphabetic index lists decrease with the subterms below. More specific codes depend on the details documented, as listed in the official index (25 codes, 23 billable).

Index entries for Decrease

absolute neutrophile count – see Neutropenia
blood
- glucose – E16.2
  - level 1 – E16.A1
  - level 2 – E16.A2
  - level 3 – E16.A3
- platelets – see Thrombocytopenia
- pressure – R03.1
  - due to shock following
    - injury – T79.4 (header)
    - operation – T81.19 (header)
estrogen – E28.39
- postablative – E89.40
  - asymptomatic – E89.40
  - symptomatic – E89.41
fragility of erythrocytes – D58.8
function
- lipase (pancreatic) – K90.3
- ovary in hypopituitarism – E23.0
- parenchyma of pancreas – K86.89
- pituitary (gland) (anterior) (lobe) – E23.0
  - posterior (lobe) – E23.0
functional activity – R68.89
glucose – E16.2
hematocrit – R71.0
hemoglobin – R71.0
leukocytes – D72.819
- specified NEC – D72.818
libido – R68.82
lymphocytes – D72.810
platelets – D69.6
respiration, due to shock following injury – T79.4 (header)
sexual desire – R68.82
tear secretion NEC – see Syndrome, dry eye
tolerance
- fat – K90.49
- glucose – R73.09
- pancreatic – K90.3
- salt and water – E87.8
vision NEC – H54.7
white blood cell count – D72.819
- specified NEC – D72.818

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.