CPT 99479E&M

Ic lbw inf 1500-2500 g subsq

CPT 99479 covers the daily follow-up care for a low birth weight baby weighing between 1500 and 2500 grams (approximately 3.3 to 5.5 pounds) who is no longer critically ill but still requires intensive hospital care.

Showing rates for

National Average

Base Medicare rate

$115.15

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

2.5

PE RVU (NF)

0.9

MP RVU

0.16

Total RVU

3.56

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Verify and document the infant's current weight daily, as weight changes may move the patient into a different code category (99478 for <1500g or standard E/M codes for >2500g)
Impact: Incorrect weight categorization can result in $20-200+ undercoding or overcoding per day; over a 30-day stay, this compounds to significant revenue loss or compliance risk
Bill 99479 only once per calendar date regardless of how many times you see the patient that day; multiple visits on the same date should be documented together in a single comprehensive note
Impact: Duplicate billing for the same date results in automatic denial of the second claim and potential fraud investigation
Transition to appropriate outpatient codes (99381-99385 or 99391-99395) immediately upon discharge; do not continue billing 99479 after the patient leaves the hospital or nursery setting
Impact: Using 99479 for outpatient follow-up visits results in 100% denial; proper code selection ensures $115.15 payment versus $0
Document time spent counseling parents about feeding, growth, medication administration, and discharge planning, as this supports the intensity of service
Impact: Strong documentation reduces audit risk and supports medical necessity; inadequate documentation is cited in 40% of neonatal E/M audits
Coordinate with hospitalist or other specialists when co-managing to ensure only one physician bills 99479 per day; use consult codes (99252-99255) or subsequent hospital care codes (99231-99233) for additional specialists
Impact: Duplicate billing by multiple physicians triggers automatic denial; proper coordination maintains the full $115.15 reimbursement

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 99479 in 2025?

The 2025 Medicare national average payment rate for CPT 99479 is $115.15 for both facility and non-facility settings. This represents 3.56 total RVUs (2.5 work RVU + 0.9 PE RVU + 0.16 MP RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic locality based on the GPCI adjustments for your specific area.

Can I bill 99479 more than once per day for the same patient?

No, CPT 99479 is a per-day code and should be reported only once per calendar date regardless of how many times you evaluate the infant during that 24-hour period. All visits and assessments performed on the same date should be combined into a single comprehensive daily note supporting one unit of 99479.

What is the weight range for billing CPT code 99479?

CPT 99479 is specifically for low birth weight infants with a present body weight of 1500 to 2500 grams (not birth weight). If the infant's current weight falls below 1500 grams, you should use 99478 instead. If the weight exceeds 2500 grams, transition to standard subsequent hospital care codes 99231-99233 based on medical decision-making complexity.

How does 99479 differ from 99478?

The primary difference is patient weight: 99478 is for infants with present body weight less than 1500 grams, while 99479 is for infants weighing 1500-2500 grams. Both represent subsequent intensive care for low birth weight infants, but 99478 typically involves higher acuity patients and has higher reimbursement. You must document current weight daily as infants may transition between these codes as they gain weight.

What documentation is required to support billing 99479?

Required documentation includes: current weight in grams (1500-2500g range), comprehensive interval history, detailed physical examination of all body systems, nutritional assessment with feeding details, respiratory status, medication review, progress assessment, family counseling notes, confirmation of intensive/intermediate care unit location, and physician signature. The note must clearly support the intensive care level of service.

Can nurse practitioners or physician assistants bill CPT 99479?

Yes, qualified non-physician practitioners (NPPs) including neonatal nurse practitioners and physician assistants with appropriate neonatal privileges can bill 99479. However, billing rules vary by payer—Medicare typically reimburses NPPs at 85% of the physician fee schedule, while some commercial payers may have different policies. State scope of practice laws and hospital credentialing also determine NPP eligibility to provide these services.

When should I stop using 99479 and transition to regular hospital E/M codes?

Transition from 99479 to standard subsequent hospital care codes (99231-99233) when the infant's weight exceeds 2500 grams or when the infant no longer requires intensive/intermediate care level monitoring and has been transferred to a general pediatric or newborn nursery. The transition should be based on both weight criteria and clinical status, with the change documented clearly in the medical record.