FY2027 ICD-10-CM reference
I10: Essential (primary) hypertension
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Essential (primary) hypertension. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
CMS-HCC V28
No V28 HCC for 2026 dates of service (CMS 2027 Initial ICD-10-CM Mappings)
CMS-HCC V24
Not used for payment year 2027 Medicare Advantage payment
ESRD
No category in the PY2026 CMS mapping; CMS 2027 initial file unchanged
PACE
Source verification pending
RxHCC
- HCC 187: Hypertension
Coefficient pending: payment year 2027 coefficients for this model are not yet verified, so no RAF is shown. Mapping: PY2026 CMS mapping; CMS 2027 initial file unchanged.
HHS-HCC
No category in the HHS-HCC 2026 benefit year mapping
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: I00-I99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: I00-I99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: I00-I99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: I00-I99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: I00-I99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: I00-I99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: I00-I99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: I00-I99 (chapter, inherited).
Excludes2
systemic connective tissue disorders (M30-M36)
Source: I00-I99 (chapter, inherited).
Excludes2
transient cerebral ischemic attacks and related syndromes (G45.-)
Source: I00-I99 (chapter, inherited).
Instructional note
code to identify:
Source: I10-I1A (section, inherited).
Instructional note
exposure to environmental tobacco smoke (Z77.22)
Source: I10-I1A (section, inherited).
Instructional note
history of tobacco dependence (Z87.891)
Source: I10-I1A (section, inherited).
Instructional note
occupational exposure to environmental tobacco smoke (Z57.31)
Source: I10-I1A (section, inherited).
Instructional note
tobacco dependence (F17.-)
Source: I10-I1A (section, inherited).
Instructional note
tobacco use (Z72.0)
Source: I10-I1A (section, inherited).
Excludes1
neonatal hypertension (P29.2)
Source: I10-I1A (section, inherited).
Excludes1
primary pulmonary hypertension (I27.0)
Source: I10-I1A (section, inherited).
Excludes2
hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
Source: I10-I1A (section, inherited).
Includes
high blood pressure
Source: I10 (category, direct).
Includes
hypertension (arterial) (benign) (essential) (malignant) (primary) (systemic)
Source: I10 (category, direct).
Excludes1
hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)
Source: I10 (category, direct).
Excludes2
essential (primary) hypertension involving vessels of brain (I60-I69)
Source: I10 (category, direct).
Excludes2
essential (primary) hypertension involving vessels of eye (H35.0-)
Source: I10 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does I10 mean in FY2027?
The official ICD-10-CM descriptor is Essential (primary) hypertension. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is I10 billable in FY2027?
The FY2027 order file marks I10 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does I10 map to an HCC?
I10 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). Under the PY2026 CMS mapping; CMS 2027 initial file unchanged: no ESRD category; RxHCC HCC 187. Coefficients for these models are pending verification for payment year 2027. HHS-HCC: no category in the HHS-HCC 2026 benefit year mapping. CMS-HCC V24: not used for payment year 2027 Medicare Advantage payment (CMS CY 2027 Rate Announcement). The PACE mapping is still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition