I1A.0
BillableResistant hypertension
Resistant hypertension
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Apparent treatment resistant hypertension
- Treatment resistant hypertension
- True resistant hypertension
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •transient cerebral ischemic attacks and related syndromesG45
- •hypertensive disease complicating pregnancy, childbirth and the puerperium,O10-O11, O13-O16
Code First
The underlying condition must be sequenced before this code
- specific type of existing hypertension, if known, such as:
- •essential hypertensionI10
- •secondary hypertensionI15
Use Additional Code
Additional codes that should follow this code
Related Conditions
Also Known As / Clinical Terms(17)
UMLS
- Apparent treatment resistant hypertensionC5819574
- HYPERTENSION RESISTANT TO CONVENTIONAL THERAPYC1834155
- Hypertension Resistant to Conventional TherapyC1834155
- Hypertension resistant to conventional therapyC1834155
- Resistant hypertensionC1834155
- Resistant hypertensive disorderC1834155
- Resistant hypertensive disorder (disorder)C1834155
- Treatment resistant hypertensionC1834155
- True resistant hypertensionC5819575
Clinical Terms
- Treatment resistant hypertension
- Hypertension Resistant to Conventional Therapy
- True resistant hypertension
- Resistant hypertensive disorder
- Resistant hypertensive disorder (disorder)
- Apparent treatment resistant hypertension
Frequently Asked Questions
What is the ICD-10 code for resistant hypertension?
The ICD-10-CM code for resistant hypertension is I1A.0. The full clinical description is "Resistant hypertension". I1A.0 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code I1A.0 mean?
ICD-10-CM code I1A.0 represents “Resistant hypertension”. It is classified under Chapter 9: Diseases of the Circulatory System and is a billable/specific code that can be used on a claim.
Is I1A.0 a billable code?
Yes, I1A.0 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is I1A.0 in?
I1A.0 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).
What codes cannot be used with I1A.0?
I1A.0 has Excludes1 notes indicating codes that cannot be used together with it, including: neonatal hypertension (P29.2); primary pulmonary hypertension (I27.0).
Are additional codes required with I1A.0?
Yes, when using I1A.0, also report: ; exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0).
What SNOMED CT codes does I1A.0 map to?
I1A.0 maps to 1 SNOMED CT concept: 461301000124109. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for I1A.0?
I1A.0 is linked to 3 UMLS Concept Unique Identifiers: C5819574, C1834155, C5819575. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does I1A.0 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like resistant hypertension affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of I1A.0?
There is no direct ICD-11 mapping available for I1A.0 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.