H16.309 — Unspecified interstitial keratitis, unspecified eye
Is H16.309 billable?
Yes, but H16.309 is an unspecified code. H16.309 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, H16.309 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 H16.309 — the more specific alternatives are listed below.
H16.309 at a glance
| Code | H16.309 |
|---|---|
| Description | Unspecified interstitial keratitis, unspecified eye |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does H16.309 group to?
H16.309 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.
- 124Other Disorders of the Eye with MCC or Thrombolytic Agentmedical
- 125Other Disorders of the Eye without MCCmedical
How is H16.309 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to H16.309. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Keratitis › deep (nodular) (nonulcerative) (simple) (zonular)
Excludes2 — not included here — inherited from Chapter 7
The conditions below are not part of H16.309, but a patient may have both at the same time. When documentation supports it, H16.309 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)
How long has H16.309 existed?
H16.309 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.