D74.0 — Congenital methemoglobinemia
Is D74.0 billable?
Yes — D74.0 is billable for FY2027. D74.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. D74.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.
D74.0 at a glance
| Code | D74.0 |
|---|---|
| Description | Congenital methemoglobinemia |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does D74.0 group to?
D74.0 sits in MDC 16 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 811Red Blood Cell Disorders with MCCmedical
- 812Red Blood Cell Disorders without MCCmedical
As a secondary diagnosis, D74.0 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is D74.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to D74.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Deficiency, deficient › NADH diaphorase or reductase
- Deficiency, deficient › NADH-methemoglobin reductase
- Disease, diseased › diaphorase deficiency
- Methemoglobinemia › congenital
- Methemoglobinemia › enzymatic
- Methemoglobinemia › Hb M disease
- Methemoglobinemia › hereditary
- Disease, diseased › hemoglobin or Hb › M
Inclusion terms
Alternative wording in documentation that is classified to D74.0.
- Congenital NADH-methemoglobin reductase deficiency
- Hemoglobin-M [Hb-M] disease
- Methemoglobinemia, hereditary
Excludes2 — not included here — inherited from Chapter 3
The conditions below are not part of D74.0, but a patient may have both at the same time. When documentation supports it, D74.0 and the excluded code may both be reported.
- autoimmune disease (systemic) NOS (M35.9)
- certain conditions originating in the perinatal period (P00-P96)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- human immunodeficiency virus [HIV] disease (B20)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has D74.0 existed?
D74.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with D74.0?
ICD-10-CM declares these codes mutually exclusive with D74.0 — exactly one of each pair can be correct for a given encounter.