RSV vs. COVID-19 in Infants and Children: How to Tell Them Apart

If you’ve ever stood over a coughing, feverish toddler and wondered “is this RSV or is this COVID?” — you’re not alone. Respiratory syncytial virus (RSV) and COVID-19 are two of the most common respiratory illnesses in infants and young children, and their symptoms overlap so much that even experienced clinicians sometimes need a lab test to be sure which one they’re dealing with.

For parents, knowing the difference matters for peace of mind and knowing when to call the pediatrician. For medical coders and health information professionals, getting the distinction right in the chart is what stands between clean claims and denied ones. This guide covers both: how RSV and COVID-19 show up in babies and kids, and how to code each one correctly.

RSV and COVID-19: Why They’re So Easy to Confuse

Both RSV and COVID-19 are highly contagious respiratory infections. Both bring on fever, coughing, shortness of breath, a runny nose, sore throat, and headaches. On the surface, a sick child with either virus can look almost the same.

The biggest tell? Gastrointestinal symptoms. RSV rarely causes vomiting, diarrhea, or stomach pain in kids — but COVID-19 often does. If a child has respiratory symptoms plus GI trouble, COVID-19 is more likely to be the culprit.

Signs of RSV in Infants and Children

RSV is a lower respiratory tract infection, and it hits hardest in young children — especially premature babies and kids with existing lung disease, heart disease, or a weakened immune system. According to the Cleveland Clinic, infants under six months and children with other health conditions are at the greatest risk of complications, and RSV sends roughly 58,000 to 80,000 children under age 5 to the hospital every year in the U.S.

In infants, watch for:

• Short, shallow, rapid breathing
• Visible struggle to breathe
• Coughing
• Poor feeding
• Unusual tiredness
• Irritability

In older children, RSV tends to look more like a cold:

• Congested or runny nose
• Dry cough
• Low-grade fever
• Sore throat
• Sneezing
• Headache

Symptoms typically show up four to six days after exposure to the virus.

Signs of COVID-19 in Infants and Children

COVID-19 spreads through respiratory droplets — from a cough, sneeze, talking, singing, or even just breathing near someone — and it can also spread through touching a contaminated surface and then the face. Kids are more likely than adults to have mild symptoms or none at all, but some still end up needing hospital or ICU care.

Infants and children with COVID-19 may experience:

• Fever
• A cough that becomes productive
• New loss of taste or smell
• Skin changes, including discolored patches on the hands and feet
• Sore throat
• Nausea, vomiting, belly pain, or diarrhea
• Chills
• Muscle aches
• Extreme fatigue
• A new, severe headache
• New nasal congestion

Complications can bring on wheezing, a barking cough (croup), and breathing difficulty. Kids with underlying conditions face a higher risk of severe symptoms, including trouble swallowing and trouble clearing mucus from the throat.

The Long-Term Effects Coders and Providers Should Document

Both viruses can leave a mark well after the initial infection clears, which is exactly why thorough documentation matters.

Research on early-life RSV infection points to a link with long-term respiratory issues — recurrent wheezing, asthma, reduced lung function, and possible allergic sensitization down the road.

Kids who’ve had COVID-19 sometimes report lingering fatigue, headaches, trouble sleeping, difficulty concentrating, muscle and joint pain, and a cough that won’t quit. These lasting symptoms can genuinely interfere with a child’s ability to function day to day.

Because of this, documentation should capture the full symptom picture — not just what’s happening today, but anything pointing to lasting effects — so the chart supports both accurate diagnosis codes and appropriate ongoing care.

ICD-10-CM Codes for RSV

B97.4 — Respiratory syncytial virus as the cause of diseases classified elsewhere — is the primary code for reporting RSV. Coders should also code the related disorder first, such as:

• Otitis media (H65.-)
• Upper respiratory infection (J06.9)

B97.4 cannot be used with these Excludes1 conditions, which have their own dedicated codes:

• Acute bronchiolitis due to RSV — J21.0
• Acute bronchitis due to RSV — J20.5
• RSV pneumonia — J12.1

ICD-10-CM Codes for COVID-19

U07.1 is the primary code for COVID-19. When there’s an associated condition, sequence a secondary code after U07.1:

Vaccination status can also be reported using:

• Z28.310 — Unvaccinated for COVID-19
• Z28.311 — Partially vaccinated for COVID-19

And when a patient simply comes in for a shot, Z23 (encounter for immunization) applies — paired with the correct procedure code for the specific immunization given.

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Getting the Documentation Right

Clear clinical documentation is everything when it comes to RSV and COVID-19 coding. If a case is lab-confirmed — via swab, chest X-ray, CT scan, blood test, or urine test — that should be spelled out in the chart. If it isn’t confirmed, every sign and symptom should be documented to the highest level of specificity so coders have what they need for accurate reporting.

Coders and providers working together on this — flagging what documentation is missing, asking the right follow-up questions — is what keeps records accurate and claims clean.

RSV Vaccine: Who Qualifies and How It’s Coded

Infants and children with serious underlying heart or lung conditions — bronchopulmonary dysplasia, cystic fibrosis, interstitial lung disease, or hemodynamically significant congenital heart disease — face the highest risk from RSV. Palivizumab (the RSV monoclonal antibody) is recommended for infants who fit any of these profiles:

• Hemodynamically significant heart disease
• Chronic lung disease of prematurity (born before 32 weeks, 0 days gestation)
• Born before 29 weeks gestation and under 12 months old at the start of RSV season (typically fall, though this varies by region)
• Younger than 3 months old, or born before 32 weeks gestation

CPT codes:

• 96380 — RSV monoclonal antibody administration, seasonal dose, intramuscular, with counseling
• 96381 — RSV monoclonal antibody administration, seasonal dose, intramuscular, without counseling

ICD-10-PCS codes (choice depends on administration site):

• 3E0134Z — Introduction of serum, toxoid, and vaccine into subcutaneous tissue, percutaneous approach
• 3E0234Z — Introduction of serum, toxoid, and vaccine into muscle, percutaneous approach

COVID-19 Vaccine: Who Qualifies and How It’s Coded

The CDC recommends a seasonal COVID-19 vaccine for children 6 months and older, decided jointly between parents and their child’s provider. Even healthy kids without underlying conditions can develop severe COVID-19 — especially if unvaccinated — which is part of why pediatricians continue to encourage the shot. Immunocompromised children may follow an extended vaccination schedule.

CPT codes:

• 90460 — Immunization administration (through age 18), with counseling, first or only component
• 90461 — Immunization administration (through age 18), with counseling, each additional component (add-on code)

ICD-10-PCS codes vary by dose and administration site:

Subcutaneous:

• XW013S6 — Dose 1
• XW013T6 — Dose 2
• XW013U6 — Single dose
• XW013V7 — Dose 3
• XW013W7 — Booster

Intramuscular:

• XW023S6 — Dose 1
• XW023T6 — Dose 2
• XW023U6 — Single dose
• XW023V7 — Dose 3
• XW023W7 — Booster

The Bottom Line

RSV and COVID-19 can look nearly identical at first glance, and the biggest clue separating them in kids is often GI symptoms — common with COVID-19, rare with RSV. For coders, the real work is in the documentation: confirmed diagnoses need clear lab evidence, unconfirmed cases need every symptom logged to the highest specificity, and vaccine encounters need the right combination of CPT and ICD-10-PCS codes. Getting this right protects both the accuracy of a child’s medical record and the integrity of the claim behind it.

FAQ

How can I tell if my child has RSV or COVID-19? Both cause fever, cough, and congestion, but COVID-19 is more likely to also bring on vomiting, diarrhea, or stomach pain. A lab test is the only way to know for certain.

What is the ICD-10 code for RSV? B97.4 is the primary code, used alongside a code for the related condition it’s causing, such as otitis media or upper respiratory infection.

What is the ICD-10 code for COVID-19? U07.1 is the primary code, paired with a secondary code for any associated condition like pneumonia, bronchitis, or respiratory failure.

Which infants qualify for the RSV vaccine? Infants with significant heart disease, chronic lung disease of prematurity, those born before 29 weeks gestation and under 12 months at the start of RSV season, and infants under 3 months or born before 32 weeks gestation.