CPT Code 99381: New Patient Infant Well-Child Visit Billing for Pediatric Practices

What Is CPT Code 99381?

CPT code 99381 is the preventive medicine evaluation and management code for an initial comprehensive visit with a new patient infant under 1 year of age. It covers the complete history, age-appropriate physical examination, anticipatory guidance, and ordering of any necessary screening tests during the baby’s first well-child visit at your practice. Code selection is based entirely on the patient’s age on the date of service, not on time spent or medical decision making complexity.

Age limit: Under 1 year (younger than 12 months on the date of service). On the child’s first birthday, the code moves to the 1-through-4 age bracket: 99382 for new patients or 99392 for established patients.

New patient only: 99381 applies when no face-to-face professional service has been provided by any physician of the same specialty in the same group practice within the past three years. An infant seen for a sick visit at your practice four months ago is an established patient, and the correct well-child code is 99391, not 99381.

Same-day sick visit: If a problem is identified during the well-child visit that requires a separately identifiable E/M service, bill the sick visit code (99212 through 99215) with modifier 25 alongside 99381. The documentation must support two distinct services.

What Does CPT 99381 Cover?

CPT 99381 is defined by the AMA as “initial comprehensive preventive medicine evaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, new patient; infant (age younger than 1 year).”

In a pediatric practice, 99381 covers the first well-baby visit for a new patient. That visit typically includes a comprehensive history covering prenatal, birth, family, and social factors; a complete physical examination including head circumference, length, weight, and developmental surveillance; anticipatory guidance for parents on topics such as safe sleep, feeding, car seat safety, and developmental milestones; and ordering of any age-appropriate screening tests such as newborn metabolic screens or developmental questionnaires.

The critical distinction is that this is a preventive visit, not a problem-focused visit. The purpose is wellness evaluation and anticipatory guidance, not the diagnosis or treatment of an active illness. If the provider identifies a problem during the preventive visit that requires a separate evaluation, that problem-focused service is billed separately under the appropriate E/M code with modifier 25.

One question we hear constantly from pediatric practice managers is whether they can bill 99381 when a newborn transfers from a hospital where they were seen by another pediatrician. The answer depends on whether the hospital pediatrician is in the same specialty group as your practice. If the hospital provider is in a different group, the infant qualifies as a new patient at your office and 99381 is correct. If the hospital provider is in the same group, the infant is established and the correct code is 99391. For how the established patient version works for older infants, see our guide on CPT code 99392, which covers the 1-through-4 age bracket.

The Preventive Medicine Code Family

CPT 99381 is the first code in the new patient preventive medicine series. Understanding where it sits in the full family prevents age-bracket errors, which are among the most common preventive visit denials in pediatrics.

Code	Patient Status	Age Range
99381	New patient	Infant (under 1 year)
99382	New patient	Early childhood (1 through 4 years)
99383	New patient	Late childhood (5 through 11 years)
99384	New patient	Adolescent (12 through 17 years)
99385	New patient	Adult (18 through 39 years)
99391	Established patient	Infant (under 1 year)
99392	Established patient	Early childhood (1 through 4 years)
99393	Established patient	Late childhood (5 through 11 years)
99394	Established patient	Adolescent (12 through 17 years)

The age that determines the code is the patient’s age on the date of service, not the age at scheduling. If a child turns 1 year old the day before the visit, the correct code moves to the 1-through-4 bracket (99382 or 99392). Practices that pre-populate the code at scheduling and do not verify it on the date of service generate preventable denials every time a birthday falls between scheduling and the visit.

Across the billing companies we vet for pediatric practices, the two most common errors in this code family are billing 99381 for an established patient and selecting the wrong age bracket when the visit falls near a birthday cutoff. Both are system-level fixes, not judgment calls: link the date of birth to the code selection logic in your practice management system and verify patient encounter history before every well-child claim.

How to Bill 99381 With a Same-Day Sick Visit

Pediatric well-child visits frequently uncover a problem that requires a separate evaluation. An infant presents for a scheduled 2-month well-child visit, and during the exam the provider identifies acute otitis media requiring treatment. The preventive visit and the problem-focused visit are both legitimate, separately identifiable services, and both can be billed on the same claim when documented correctly.

Bill 99381 for the preventive visit with the well-child diagnosis code (Z00.129 for no abnormal findings, or Z00.121 if the problem qualifies as an abnormal finding identified during the well-child exam). Then bill the appropriate E/M code (99212 through 99215 based on the medical decision making for the problem) with modifier 25 appended to indicate the E/M was a significant, separately identifiable service. Link the E/M code to the diagnosis that supports the problem-focused visit, such as H66.001 for acute otitis media of the right ear.

The documentation must support two distinct services. The well-child note covers the comprehensive preventive evaluation: history, exam, anticipatory guidance, and screening. The problem-focused note covers the separately identifiable evaluation of the acute condition: the presenting complaint, focused exam, assessment, and plan. If the problem is trivial and handled entirely within the scope of the preventive visit, such as advising diaper cream for a minor rash, it does not justify a separate E/M code or modifier 25.

Providers often come to us after discovering that their same-day sick and well visit claims are being denied because the documentation does not clearly separate the two services. The preventive visit note says “ears clear bilaterally” and the sick visit note diagnoses otitis media at the same encounter. That contradiction gives the payer grounds to deny the second service. A billing partner experienced in pediatrics builds documentation templates that prompt the provider to capture the well-child elements and the problem-focused elements in clearly separated sections, so the modifier 25 claim is defensible. For a deeper look at how the CPT 99213 level fits with same-day well-child billing, see our 99213 guide.

Documentation Requirements for 99381

CPT 99381 requires documentation of a comprehensive preventive evaluation for a new patient infant. The note must support every element the code describes, and missing any one of them is grounds for a denial or audit recoupment.

Comprehensive history. The note must document the infant’s prenatal and birth history, family medical history, social history (living situation, caregivers, exposures), and a review of systems appropriate to the infant’s age.

Age-appropriate physical examination. The exam must be comprehensive and include measurements (head circumference, length, weight), vital signs, and a systematic examination of all relevant organ systems. Document the specific findings, not just “normal exam.”

Anticipatory guidance. This is the element most often missing in 99381 audits. The note must document what counseling was actually provided to the parent or caregiver. Topics should align with the AAP Bright Futures guidelines for the infant’s age: safe sleep positioning, breastfeeding or formula guidance, car seat safety, injury prevention, and developmental milestones to expect. “Anticipatory guidance given” as a single line entry is not sufficient. Document the specific topics discussed.

Screening and diagnostic orders. Document any screening tests ordered or performed, such as developmental screening questionnaires (billed separately under CPT 96110), hearing screening, or metabolic screening follow-up. If no tests were ordered, document that no additional testing was indicated at this age.

In our experience matching providers with billing partners through Pediatrician Billers, the single most common documentation deficiency on 99381 claims is the anticipatory guidance section. Providers perform the counseling at every visit but do not document it with enough specificity to survive an audit. A billing partner with pediatric experience builds note templates that prompt for age-specific anticipatory guidance topics so the documentation matches the work.

Common 99381 Billing Mistakes

Every pediatric practice that sees new patient infants encounters the same 99381 errors. Treating these as workflow fixes rather than one-off corrections is what separates practices that bill preventive visits cleanly from those that generate preventable denials.

Billing 99381 for an established patient. If the infant has had any face-to-face professional service from any provider of the same specialty in the same group within the past three years, the infant is established. The correct well-child code is 99391. Payers cross-reference claims history, and a 99381 on an established infant triggers a documentation request or outright denial.

Selecting the wrong age bracket. If the infant has turned 1 before the date of service, the correct code moves to 99382 (new patient, age 1-4) or 99392 (established, age 1-4). Code selection must be verified against the patient’s date of birth on the date of the visit, not at scheduling.

Missing anticipatory guidance documentation. “AG given” or “anticipatory guidance provided” without specifying the topics discussed does not meet the documentation standard. Audit reviewers expect to see the specific subjects covered: sleep positioning, feeding, immunization schedule discussion, car seat use, developmental milestones.

Not billing a separately identifiable sick visit with modifier 25. When a problem is identified during the well-child visit that requires a meaningful separate evaluation, the E/M for the problem should be billed with modifier 25. Missing this modifier means the practice performed the work but did not capture the revenue.

Using the wrong diagnosis code. The primary diagnosis for a routine well-child visit is Z00.129 (encounter for routine child health examination without abnormal findings) or Z00.121 (with abnormal findings). Newborn supervision visits use Z00.110 or Z00.111. Using a problem-focused ICD-10 code as the primary diagnosis on a 99381 claim signals to the payer that the visit was not preventive, which can trigger a denial.

Frequently Asked Questions