2027 ICD-10-CM Diagnosis Code B34.3Parvovirus infection, unspecified
ICD-10-CM Codes›A00–B99›B25-B34›B34
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B34.3 is a billable ICD-10-CM diagnosis code for parvovirus infection, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. 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 2 closely related codes. Coders also document this condition as acquired aplastic anemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired aplastic anemia
- Aleutian disease
- Aplastic anemia due to infection
- Congenital human parvovirus infection
- Congenital parvoviral infection
- Disease caused by Parvoviridae
- Infection caused by Erythroparvovirus
- Parvoviral aplastic crisis
- Parvovirus infection
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B34.3: its own notes plus those printed at B34 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
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.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B34.3, its category, or a range that includes it.
Applicable To 1
These notes mention B34.3.
- O98.5 Other viral diseases complicating pregnancy, childbirth and the puerperium
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.
Patient EducationClinical
Viral Infections
Viruses are very tiny germs. They are made of genetic material (either DNA or RNA) inside of a protein coating. There are a huge number of viruses on earth. Only a small number of them can infect humans. Those viruses can infect our cells, which may cause disease.
The full article covers:
- What are viruses?
- How are viruses spread?
- How do viruses cause disease?
- What are the treatments for viral infections?
- Can viral infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B34.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B34.3Overview
What is the ICD-10 code for parvovirus infection, unspecified?
The ICD-10-CM code for parvovirus infection, unspecified is B34.3 (sometimes written as B343). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B34.3 (Viral infection of unspecified site) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report parvovirus infection, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B34.3 group to?
When parvovirus infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B34.3 a CC or MCC?
CMS lists B34.3 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 2 closely related codes in its exclusion list.
Can B34.3 be reported with A63.0?
Not as a rule. The Excludes1 note at B34, which applies to B34.3, lists "anogenital human papillomavirus infection (A63.0)". 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).
