I1A ICD-10-CM Code: Other hypertension
I1A is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Hypertensive diseases (I10-I1A)
I1A
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceOther hypertension
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for I1A. Check the code and parent instructions in the Code Book.
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from I00-I99, I10-I1A
- certain infectious and parasitic diseases (A00-B99)Inherited from I00-I99, I10-I1A
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from I00-I99, I10-I1A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from I00-I99, I10-I1A
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from I00-I99, I10-I1A
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from I00-I99, I10-I1A
- neoplasms (C00-D49)Inherited from I00-I99, I10-I1A
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from I00-I99, I10-I1A
- systemic connective tissue disorders (M30-M36)Inherited from I00-I99, I10-I1A
- transient cerebral ischemic attacks and related syndromes (G45.-)Inherited from I00-I99, I10-I1A
- hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)Inherited from I00-I99, I10-I1A
Related Codes
Includes
OfficialNo Includes notes are included in this display for I1A. Check the code and parent instructions in the Code Book.
Excludes 1
Official- neonatal hypertension (P29.2)Inherited from I10-I1A
- primary pulmonary hypertension (I27.0)Inherited from I10-I1A
Code First
OfficialNo Code First sequencing instructions are included in this display for I1A. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify:Inherited from I10-I1A
- exposure to environmental tobacco smoke (Z77.22)Inherited from I10-I1A
- history of tobacco dependence (Z87.891)Inherited from I10-I1A
- occupational exposure to environmental tobacco smoke (Z57.31)Inherited from I10-I1A
- tobacco dependence (F17.-)Inherited from I10-I1A
- tobacco use (Z72.0)Inherited from I10-I1A
Code Also
OfficialNo Code Also instructions are included in this display for I1A. Check the code and parent instructions in the Code Book.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- I1A
- Description
- Other hypertension
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
I1A is the ICD-10-CM diagnosis code for other hypertension. I1A sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering hypertensive diseases (i10-i1a).
Header codes like I1A cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I1A sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.