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ICD-10-CM 2027 diagnosis code

P05.09Newborn light for gestational age, 2500 grams and over

✓ Billable / specific

P05.09 is a valid, billable ICD-10-CM code for newborn light for gestational age, 2500 grams and over. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About P05.09

P05.09 is the ICD-10-CM diagnosis code for newborn light for gestational age, 2500 grams and over. It belongs to category P05 (disorders of newborn related to slow fetal growth and fetal malnutrition), block P05-P08 (disorders of newborn related to length of gestation and fetal growth) and chapter 16 (certain conditions originating in the perinatal period). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within P05.0 (newborn light for gestational age), P05.09 is specifically for newborn light for gestational age, 2500 grams and over. Related codes cover unspecified weight (P05.00), less than 500 grams (P05.01), 500-749 grams (P05.02), 750-999 grams (P05.03), 1000-1249 grams (P05.04), 1250-1499 grams (P05.05), 1500-1749 grams (P05.06), 1750-1999 grams (P05.07) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 764.00 ("Light-for-dates" without mention of fetal malnutrition, unspecified [weight]), 764.09 ("Light-for-dates" without mention of fetal malnutrition, 2,500 grams and over) and 764.19 ("Light-for-dates"with signs of fetal malnutrition, 2,500 grams and over).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Newborn light for gestational age, other

Notes that apply from higher levels

Instructions written at a parent level also apply to P05.09.

Broader instructions also apply from Chapter 16: Certain conditions originating in the perinatal period.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to P05.09.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 764.00"Light-for-dates" without mention of fetal malnutrition, unspecified [weight]approximate
  • 764.09"Light-for-dates" without mention of fetal malnutrition, 2,500 grams and overapproximate
  • 764.19"Light-for-dates"with signs of fetal malnutrition, 2,500 grams and overapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2017 (effective 10/1/2016): Added
  • No changes since FY2017.

Common questions about P05.09

Is P05.09 billable?

Yes. P05.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can P05.09 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict P05.09 as a principal diagnosis.

Is P05.09 a CC or MCC?

No. P05.09 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does P05.09 group to?

P05.09 is used in the MS-DRG v44.0 logic for MS-DRG 794 (Neonate with Other Significant Problems). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for P05.09?

The CMS General Equivalence Mappings map P05.09 to ICD-9-CM 764.00, 764.09 and 764.19.