Medical Coding Haemophilus influenzae

ICD-10-CM Coding for Haemophilus influenzae

Here’s a clear and thorough guide for billing and ICD-10-CM coding for Haemophilus influenzae (H. influenzae) — not to be confused with the flu (influenza virus). This bacterium can cause serious invasive diseases like meningitis, epiglottitis, pneumonia, and sepsis.

Common ICD-10 Diagnosis Codes:

Vaccination Coding for Hib (Haemophilus influenzae type b)

Vaccination is specifically for Hib, primarily in pediatric populations.

CPT Codes – Hib Vaccine:

Vaccine Administration Codes:

Diagnosis Code for Immunization:

• Z23 – Encounter for immunization

Billing Tips

When treating H. influenzae infection:

• Use the most specific ICD-10 code (e.g., J14 for pneumonia).

• Document organism identification (via culture or PCR).

• If multiple complications are present, code each condition (e.g., meningitis and sepsis).

When billing for Hib vaccine:

• Use Z23 as the primary diagnosis.

• Ensure proper documentation of:

  • Manufacturer, lot number

  • Route, site of administration

  • Parent/guardian consent

  • Counseling (if billing 90460/90461)

Clinical and Coding Scenarios

Example 1: Hib Meningitis

• ICD-10: G00.0

• Supporting codes: Fever (R50.9), seizures (R56.9) if present

Example 2: Hib Pneumonia

• ICD-10: J14

• Avoid generic pneumonia codes unless cause is unknown

Example 3: Well-child visit with Hib vaccine

• CPT: 90648

• Admin: 90460 (if counseling given)

• ICD-10: Z23 + Z00.129 (routine child visit)

Compliance & Documentation Tips

• Use lab confirmation if billing for a specific organism (especially G00.0 or A41.3).

• Avoid generic infection codes when a specific bacterial etiology is documented.

• When giving the Hib vaccine:

  • Include documentation of education/counseling if using 90460

  • Include Z23 in diagnosis

• Check payer-specific policies: Some Medicaid/CHIP plans have unique guidelines for vaccine billing

Summary Coding Table

CDC Haemophilus influenzae surveillance

Frequently Asked Questions About H. influenzae Coding

What is the ICD-10 code for H. influenzae pneumonia?

J14, Pneumonia due to Hemophilus influenzae.

How do I code H. influenzae as the cause of another infection?

When there is no combination code for the condition, code the condition first and add B96.3, Hemophilus influenzae as the cause of diseases classified elsewhere.

What is the code for acute bronchitis due to H. influenzae?

J20.1, Acute bronchitis due to Hemophilus influenzae.

Which administration code goes with a Hib vaccine for a child?

Use 90460 (and 90461 for each additional component) when the provider counsels a patient through age 18; otherwise use 90471 and 90472.

Ready to become a certified medical coder? Our online CPC certification training prepares you for the AAPC CPC exam with a credentialed instructor. Many students train at little or no cost through medical coding scholarships and WIOA grants available in 30+ states.