2027 ICD-10-CM Diagnosis Code I48.19Other persistent atrial fibrillation
ICD-10-CM Codes›I00–I99›I30-I5A›I48
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 238
- Chronic Condition
I48.19 is a billable ICD-10-CM diagnosis code for other persistent atrial fibrillation. 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. Coders also document this condition as atrial fibrillation due to heart valve disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac dysrhythmias.
For Medicare Advantage risk adjustment, I48.19 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.
This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such atrial fibrillation and flutter.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I48.19 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.
- Atrial fibrillation due to heart valve disorder
- Persistent atrial fibrillation
- Persistent atrial fibrillation due to heart valve disorder
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I48.19: its own notes plus those printed at I48.1 and 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.
- Chronic persistent atrial fibrillation
- Persistent atrial fibrillation, NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I48.19, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming I48.19: they are not reported together with it, unless the two conditions are unrelated.
- I48.20 Chronic atrial fibrillation, unspecifiedChronic persistent atrial fibrillation (I48.19)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Persistent Atrial Fibrillation by ECG Finding
an electrocardiographic tracing demonstrating atrial fibrillation that is present during the entire recording.
Patient EducationClinical
Atrial Fibrillation
Atrial fibrillation, also known as AFib or AF, is one of the most common types of arrhythmias. Arrhythmias are problems with the rate or rhythm of your heartbeat. They can cause your heart to beat too slowly, too fast, or in an irregular way.
The full article covers:
- What is atrial fibrillation (AFib)?
- What causes atrial fibrillation (AFib)?
- Who is more likely to develop atrial fibrillation (AFib)?
- What are the symptoms of atrial fibrillation (AFib)?
- What other problems can AFib cause?
- How is atrial fibrillation (AFib) diagnosed?
- What are the treatments for atrial fibrillation (AFib)?
- Can atrial fibrillation (AFib) be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement I48.19 replaces the following previously assigned code(s):
- I48.1 - Persistent atrial fibrillation
Questions About I48.19Overview
What is the ICD-10 code for other persistent atrial fibrillation?
The ICD-10-CM code for other persistent atrial fibrillation is I48.19 (sometimes written as I4819). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I48.19 (Persistent atrial fibrillation) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other persistent atrial fibrillation on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I48.19 group to?
When other persistent atrial fibrillation 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 I48.19 a CC or MCC?
CMS lists I48.19 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.
Can I48.19 be reported with I48.21?
Not as a rule. The Excludes1 note at I48.1, which applies to I48.19, lists "Permanent atrial fibrillation (I48.21)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is I48.19?
I48.19 (other persistent atrial fibrillation) 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. In the Part D prescription drug model it maps to RxHCC 193.
Does I48.19 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I48.19 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.
