I16.1 — Hypertensive emergency
Is I16.1 billable?
Yes — I16.1 is billable for FY2027. I16.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I16.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I16.1 at a glance
| Code | I16.1 |
|---|---|
| Description | Hypertensive emergency |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I16.1 group to?
I16.1 sits in MDC 05 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.
- 304Hypertension with MCCmedical
- 305Hypertension without MCCmedical
As a secondary diagnosis, I16.1 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is I16.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I16.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hypertension, hypertensive › emergency (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
Code also
Two codes may be needed to describe the condition fully. Whether I16.1 is sequenced first depends on the reason for the encounter.
- , if applicable, to identify specific organ dysfunction, such as:
- acute kidney injury (N17.-)
- acute myocardial infarction (I21.-)
- acute pulmonary edema (left and/or right ventricular failure) (J81.0, I50.-)
- aortic dissection (I71.0-)
- cerebral hemorrhage (I60.-. I61.-, I62.-)
- cerebral infarction (I63.-)
- eclampsia (O15.-)
- hypertensive encephalopathy (I67.4)
- seizure (R56.9)
Excludes1 — never code together — inherited from I10-I1A
The conditions below can never be reported together with I16.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from I10-I1A
Report an additional code alongside I16.1 to fully describe the condition. I16.1 is sequenced first.
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I16.1, but a patient may have both at the same time. When documentation supports it, I16.1 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)
- endocrine, nutritional and metabolic diseases (E00-E88)
- 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)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Excludes2 — not included here — inherited from I10-I1A
The conditions below are not part of I16.1, but a patient may have both at the same time. When documentation supports it, I16.1 and the excluded code may both be reported.
Code also — inherited from I16
Two codes may be needed to describe the condition fully. Whether I16.1 is sequenced first depends on the reason for the encounter.
How long has I16.1 existed?
I16.1 first appears in FY2018 (FY2017 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.