Subclinical iodine-deficiency hypothyroidism
In Disorders of thyroid gland (E00-E07), chapter 4: Endocrine, Nutritional and Metabolic Diseases
- E02 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under E00-E07 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as chronic: expected to last 12 months or longer and to limit daily life or need ongoing care.
Also indexed as: Hypothyroidism, due to, iodine-deficiency, acquired, subclinical; Hypothyroidism, iodine-deficiency, subclinical; Hypothyroidism, subclinical, iodine-deficiency related
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers diabetes mellitus coding, including type, insulin and drug use, pump malfunction and secondary diabetes, plus obesity and obesity class codes.
- Diabetes mellitus (page 39)
- Obesity (page 42)
Other codes under E00-E07
Disorders of thyroid gland (E00-E07)
E02 MS-DRGs
As the principal diagnosis, E02 groups to MS-DRG 643, 644, or 645 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
E02 is in Thyroid disorders (END001, its default category), with 56 codes. Others in it:
- A18.81 Tuberculosis of thyroid gland
- B67.31 Echinococcus granulosus infection, thyroid gland
- E00.0 Congenital iodine-deficiency syndrome, neurological type
- E00.1 Congenital iodine-deficiency syndrome, myxedematous type
- E00.2 Congenital iodine-deficiency syndrome, mixed type
- E00.9 Congenital iodine-deficiency syndrome, unspecified
- E01.0 Iodine-deficiency related diffuse (endemic) goiter
- E01.1 Iodine-deficiency related multinodular (endemic) goiter
Medicare coverage articles listing E02
These 2 Medicare billing and coding articles list E02 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to E02
Notes on these codes point to E02.
- E00 Excludes1: subclinical iodine-deficiency hypothyroidism (E02)
- E01 Excludes1: subclinical iodine-deficiency hypothyroidism (E02)
- E03 Excludes1: iodine-deficiency related hypothyroidism (E00-E02)
- E04 Excludes1: iodine-deficiency related goiter (E00-E02)
- E61 Excludes1: iodine deficiency related thyroid disorders (E00-E02)
- Q86 Excludes2: iodine-deficiency-related hypothyroidism (E00-E02)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Hypothyroidism
Hypothyroidism, or underactive thyroid, happens when your thyroid gland doesn't make enough thyroid hormones to meet your body's needs. Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy. These hormones affect nearly every organ in your body and control many of your body's most important functions. For example, they affect your breathing, heart rate, weight, digestion, and moods. Without enough thyroid hormones, many of your body's functions slow down. But there are treatments that can help.
Read more about hypothyroidism on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 244.8 Other specified acquired hypothyroidism (approximate)