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ICD-10-CM 2027 diagnosis code

E00.2Congenital iodine-deficiency syndrome, mixed type

✓ Billable / specific

E00.2 is a valid, billable ICD-10-CM code for congenital iodine-deficiency syndrome, mixed type. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 E00.2

E00.2 is the ICD-10-CM diagnosis code for congenital iodine-deficiency syndrome, mixed type. It belongs to category E00 (congenital iodine-deficiency syndrome), block E00-E07 (disorders of thyroid gland) and chapter 4 (endocrine, nutritional and metabolic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within E00 (congenital iodine-deficiency syndrome), E00.2 is specifically for congenital iodine-deficiency syndrome, mixed type. Related codes cover neurological type (E00.0), myxedematous type (E00.1) and unspecified (E00.9).

Use an additional code (F70-F79) to identify associated intellectual disabilities.

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 643 (Endocrine Disorders with MCC, relative weight 1.6139), DRG 644 (Endocrine Disorders with CC, relative weight 1.0044) and DRG 645 (Endocrine Disorders without CC/MCC, relative weight 0.7459), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), 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 243 (congenital hypothyroidism).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Endemic cretinism, mixed type

Notes that apply from higher levels

Instructions written at a parent level also apply to E00.2.

› From E00 Congenital iodine-deficiency syndrome
Excludes1
  • subclinical iodine-deficiency hypothyroidism (E02)
Use additional code
  • code (F70-F79) to identify associated intellectual disabilities.

Broader instructions also apply from Chapter 4: Endocrine, nutritional and metabolic diseases.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to E00.2.

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.

ICD-9-CM equivalent

Converter →
  • 243Congenital hypothyroidismapproximate

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 E00.2

Is E00.2 billable?

Yes. E00.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can E00.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict E00.2 as a principal diagnosis.

Is E00.2 a CC or MCC?

No. E00.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does E00.2 group to?

E00.2 is used in the MS-DRG v44.0 logic for MS-DRG 643 (Endocrine Disorders with MCC), MS-DRG 644 (Endocrine Disorders with CC) and MS-DRG 645 (Endocrine Disorders without CC/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 E00.2?

The CMS General Equivalence Mappings map E00.2 to ICD-9-CM 243.