2027 ICD-10-CM Diagnosis Code P52.5Subarachnoid (nontraumatic) hemorrhage of newborn
ICD-10-CM Codes›P00–P96›P50-P61›P52
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 248
- Not Chronic
P52.5 is a billable ICD-10-CM diagnosis code for subarachnoid (nontraumatic) hemorrhage of newborn. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 49 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hemorrhagic and hematologic disorders of newborn.
For Medicare Advantage risk adjustment, P52.5 maps to CMS-HCC Category 248 (Intracranial Hemorrhage) under the V28 model, adding a risk factor of about 0.239 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
P52.5 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Convexal subarachnoid hemorrhage
- Cryptogenic non-traumatic subarachnoid hemorrhage of brain
- Decreased flexion
- Early neonatal intracerebral hemorrhage
- Early neonatal non-traumatic hemorrhage of subarachnoid space of brain
- Early neonatal non-traumatic intracerebral hemorrhage
- Early neonatal nontraumatic intracranial hemorrhage
- Headache due to spontaneous subarachnoid hemorrhage
- Hemorrhage into subarachnoid space of neuraxis
- Hemorrhage into subarachnoid space of spine
- Hemorrhage into subpial space of neuraxis
- Neonatal nontraumatic subarachnoid hemorrhage
- Non-traumatic hemorrhage of subarachnoid space from vertebral artery
- Nontraumatic subarachnoid hemorrhage with brain compression
- Nuchal rigidity
- Nuchal rigidity due to subarachnoid hemorrhage
- Perinatal subarachnoid hemorrhage
- Spontaneous hemorrhage of subarachnoid space from basilar artery
- Spontaneous hemorrhage of subarachnoid space from intracranial artery
- Spontaneous hemorrhage of subarachnoid space from left middle cerebral artery
- Spontaneous hemorrhage of subarachnoid space from left posterior communicating artery
- Spontaneous hemorrhage of subarachnoid space from right middle cerebral artery
- Spontaneous hemorrhage of subarachnoid space from right posterior communicating artery
- Spontaneous rupture of left posterior communicating artery
- Spontaneous rupture of right posterior communicating artery
- Spontaneous subarachnoid hemorrhage
- Subarachnoid hemorrhage
- Subarachnoid hemorrhage from vertebral artery
- Subdural intracranial hematoma with subarachnoid intracranial hemorrhage
- Subpial intracranial hemorrhage
- Transient ischemic attack co-occurrent with subarachnoid hemorrhage
- Vertebral artery rupture
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P52.5: its own notes plus those printed at P52, block P50-P61, and Chapter 16. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- intracranial hemorrhage due to anoxia or hypoxia
- conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- Codes from this chapter are for use on newborn records only, never on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name P52.5, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming P52.5: they are not reported together with it, unless the two conditions are unrelated.
- P10 Intracranial laceration and hemorrhage due to birth injuryintracranial hemorrhage of newborn due to anoxia or hypoxia (P52.-) names P52.-, which includes this code
- P10 Intracranial laceration and hemorrhage due to birth injurynontraumatic intracranial hemorrhage of newborn (P52.-) names P52.-, which includes this code
- P84 Other problems with newbornintracranial hemorrhage due to anoxia or hypoxia (P52.-) names P52.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming P52.5: its condition is not part of those codes, and both may be reported when the patient has both.
- P91.82 Neonatal cerebral infarctionintracranial hemorrhage of newborn (P52.-) names P52.-, which includes this code
- Block R70-R79 Abnormal findings on examination of blood, without diagnosis
Code First 1
These codes say to code first a condition named in the note, and P52.5 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Hematoma (traumatic) (skin surface intact) See Also: Contusion;
subarachnoid (traumatic) See: Injury, intracranial, subarachnoid hemorrhage;
newborn (nontraumatic) P52.5
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
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Convert P52.5 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P52.5Overview
What is the ICD-10 code for subarachnoid (nontraumatic) hemorrhage of newborn?
The ICD-10-CM code for subarachnoid (nontraumatic) hemorrhage of newborn is P52.5 (sometimes written as P525). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is P52.5 (Intracranial nontraumatic hemorrhage of newborn) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report subarachnoid (nontraumatic) hemorrhage of newborn on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P52.5 group to?
When subarachnoid (nontraumatic) hemorrhage of newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P52.5 a CC or MCC?
CMS lists P52.5 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 49 closely related codes in its exclusion list.
Can P52.5 be reported with a code from P10?
Not as a rule. The Excludes1 note at P52, which applies to P52.5, lists "intracranial hemorrhage due to birth injury (P10.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is P52.5?
P52.5 (subarachnoid (nontraumatic) hemorrhage of newborn) maps to CMS-HCC Category 248 (Intracranial Hemorrhage), commonly written as HCC 248, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It does not map to any RxHCC in the Part D prescription drug model.
Does P52.5 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, P52.5 adds a risk adjustment factor of about 0.239 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.081 to 0.377 depending on the payment segment). HCC 248 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 248 category page.
