H44.121 — Parasitic endophthalmitis, unspecified, right eye
Is H44.121 billable?
Yes, but H44.121 is an unspecified code. H44.121 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, H44.121 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting H44.121 — the more specific alternatives are listed below.
H44.121 at a glance
| Code | H44.121 |
|---|---|
| Description | Parasitic endophthalmitis, unspecified, right eye |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does H44.121 group to?
H44.121 sits in MDC 02 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.
- 121Acute Major Eye Infections with CC/MCCmedical
- 122Acute Major Eye Infections without CC/MCCmedical
As a secondary diagnosis, H44.121 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is H44.121 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under H44.12, the nearest indexed parent of H44.121. Use them to find the family, then select the specific code.
- Endophthalmitis › parasitic (acute) (infective) (metastatic) (subacute)
Excludes1 — never code together — inherited from H44.1
The conditions below can never be reported together with H44.121 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- bleb associated endophthalmitis (H59.4-)
Excludes2 — not included here — inherited from Chapter 7
The conditions below are not part of H44.121, but a patient may have both at the same time. When documentation supports it, H44.121 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury (trauma) of eye and orbit (S05.-)
- 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)
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
Excludes2 — not included here — inherited from H44.1
The conditions below are not part of H44.121, but a patient may have both at the same time. When documentation supports it, H44.121 and the excluded code may both be reported.
- ophthalmia nodosa (H16.2-)
How long has H44.121 existed?
H44.121 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.