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ICD-10-CM 2027 diagnosis code

I78.1Nevus, non-neoplastic

✓ Billable / specific

I78.1 is a valid, billable ICD-10-CM code for nevus, non-neoplastic. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Telangiectasia, ICD-10 code for Capillary hemangioma.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I78.1

I78.1 is the ICD-10-CM diagnosis code for nevus, non-neoplastic. It belongs to category I78 (diseases of capillaries), block I70-I79 (diseases of arteries, arterioles and capillaries) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I78 (diseases of capillaries), I78.1 is specifically for nevus, non-neoplastic. Related codes cover hereditary hemorrhagic telangiectasia (I78.0), other diseases of capillaries (I78.8) and disease of capillaries, unspecified (I78.9).

Don't report I78.1 together with the conditions in its Excludes1 note: nevus NOS (D22.-) and vascular NOS (Q82.5).

The conditions in its Excludes2 note aren't part of I78.1, but may be coded alongside it if the patient has both: blue nevus (D22.-), flammeus nevus (Q82.5), hairy nevus (D22.-), melanocytic nevus (D22.-) and 5 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 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 448.1 (nevus, non-neoplastic).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Araneus nevus
  • Senile nevus
  • Spider nevus
  • Stellar nevus
Excludes1Not coded here — never report together with this code
Excludes2Not included here — may be reported together if both conditions exist
  • blue nevus (D22.-)
  • flammeus nevus (Q82.5)
  • hairy nevus (D22.-)
  • melanocytic nevus (D22.-)
  • pigmented nevus (D22.-)
  • portwine nevus (Q82.5)
  • sanguineous nevus (Q82.5)
  • strawberry nevus (Q82.5)
  • verrucous nevus (Q82.5)

Notes that apply from higher levels

Instructions written at a parent level also apply to I78.1.

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

18 entries

Terms in the official ICD-10-CM index that lead to I78.1.

Codes whose notes reference I78.1

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 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast

ICD-9-CM equivalent

Converter →
  • 448.1Nevus, non-neoplasticexact

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I78.1

Is I78.1 billable?

Yes. I78.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I78.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I78.1 as a principal diagnosis.

Is I78.1 a CC or MCC?

No. I78.1 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I78.1 group to?

I78.1 is used in the MS-DRG v44.0 logic for MS-DRG 606 (Minor Skin Disorders with MCC) and MS-DRG 607 (Minor Skin Disorders without MCC). 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 I78.1?

The CMS General Equivalence Mappings map I78.1 to ICD-9-CM 448.1.