I1A.0 — Resistant hypertension
Is I1A.0 billable?
Yes — I1A.0 is billable for FY2027. I1A.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. I1A.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.
I1A.0 at a glance
| Code | I1A.0 |
|---|---|
| Description | Resistant hypertension |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does I1A.0 group to?
I1A.0 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
How is I1A.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I1A.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hypertension, hypertensive › resistant (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
Code first
The underlying condition below must be sequenced before I1A.0. I1A.0 describes a manifestation and cannot be the principal or first-listed diagnosis.
Inclusion terms
Alternative wording in documentation that is classified to I1A.0.
- Apparent treatment resistant hypertension
- Treatment resistant hypertension
- True resistant hypertension
Excludes1 — never code together — inherited from I10-I1A
The conditions below can never be reported together with I1A.0 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 I1A.0 to fully describe the condition. I1A.0 is sequenced first.
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I1A.0, but a patient may have both at the same time. When documentation supports it, I1A.0 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 I1A.0, but a patient may have both at the same time. When documentation supports it, I1A.0 and the excluded code may both be reported.
How long has I1A.0 existed?
I1A.0 first appears in FY2024.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.