2027 ICD-10-CM Diagnosis Code I44.2Atrioventricular block, complete
ICD-10-CM Codes›I00–I99›I30-I5A›I44
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 238
- Chronic Condition
I44.2 is a billable ICD-10-CM diagnosis code for atrioventricular block, complete. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 308 through 310, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 54 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Conduction disorders.
For Medicare Advantage risk adjustment, I44.2 maps to CMS-HCC Category 238 (Specified Heart Arrhythmias) under the V28 model, adding a risk factor of about 0.299 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I44.2 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accelerated idioventricular rhythm
- Acquired complete atrioventricular block
- Agonal rhythm
- Complete atrioventricular block
- Complete atrioventricular block as complication of atrioventricular nodal ablation
- ECG: idioventricular rhythm
- EKG: complete atrioventricular block
- Fusion beats
- Idioventricular rhythm
- Lev's syndrome
- Parasystole
- Postoperative atrioventricular block
- Postoperative cardiac arrhythmia
- Postoperative complete heart block
- Progressive familial heart block
- Ventricular escape beat
- Ventricular escape rhythm
- Ventricular parasystole
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I44.2: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Complete heart block NOS
- Third degree block
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
atrioventricular (incomplete) (partial) I44.30
complete I44.2
third degree I44.2
complete I44.2
third degree I44.2
Disease, diseased See Also: Syndrome;
Lenegre's I44.2
Lenegre's disease I44.2
idioventricular I44.2
Rytand-Lipsitch syndrome I44.2
Syndrome See Also: Disease;
Lev's I44.2
Rytand-Lipsitch I44.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Atrioventricular Block
impaired impulse conduction from heart atria to heart ventricles. av block can mean delayed or completely blocked impulse conduction.
Patient EducationClinical
Arrhythmia
An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.
The full article covers:
- What is an arrhythmia?
- What causes an arrhythmia?
- What are the symptoms of an arrhythmia?
- How is an arrhythmia diagnosed?
- What are the treatments for an arrhythmia?
- Can arrhythmias be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I44.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I44.2Overview
What is the ICD-10 code for atrioventricular block, complete?
The ICD-10-CM code for atrioventricular block, complete is I44.2 (sometimes written as I442). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I44.2 (Atrioventricular and left bundle-branch block) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report atrioventricular block, complete on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I44.2 group to?
When atrioventricular block, complete is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 309, 310, 308, with relative weights from 0.5686 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I44.2 a CC or MCC?
CMS lists I44.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 54 closely related codes in its exclusion list.
What is the ICD-9 equivalent of I44.2?
Under the General Equivalence Mappings, atrioventricular block, complete converts to ICD-9-CM 426.0 (atriovent block complete). The mapping is a direct match.
What HCC is I44.2?
I44.2 (atrioventricular block, complete) maps to CMS-HCC Category 238 (Specified Heart Arrhythmias), commonly written as HCC 238, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 96 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does I44.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I44.2 adds a risk adjustment factor of about 0.299 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.245 to 0.407 depending on the payment segment). HCC 238 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 238 category page.
