Thyroid Cancer Test and ICD Codes

Test and ICD Codes – Current as of 15 December, 2021
These test and ICD codes can be helpful if your tests are being ordered by a primary care provider or an endocrinologist who does not specialize with thryoid cancer patients.

Order CodeOrder Code NameResult CodeResult Code NameUnits
224576TSH+Free T4
4264 19745TSH T4,Free(Direct)uIU/mL ng/dL
10389Triiodothyronine (T3), Free10389Triiodothyronine (T3), Freepg/mL
42045TgAb+Thyroglobulin,IMA or LCMS
6706
166013
Thyroglobulin Antibody Thyroglobulin StorageIU/mL
2139CEA2169CEAng/mL
4895Calcitonin, Serum4896Calcitonin, Serumpg/mL
CEA and Calcitonin are only for medullary thyroid cancer monitoring.  CEA alone is not diagnostic. 

Quest Diagnostics
https://testdirectory.questdiagnostics.com/test/home

Test CodeNameCPT CodeDescriptionUnits
899TSH84443Thyroid Stimulating HormonemIU/L
866T4 Free (FT4)84439Thyroxine, freeng/dL
34429T3, Free84481Triiodothyronine T3; freepg/mL
90814Thyroid Cancer Monitor
(Thyroglobulin)
86800
Thyroglobulin Antibody
≤1 IU/mL

Similar to  LabCorp 42045 
ThyroglobulinAthyrotic: <0.1 ng/mL



Thyroglobulin, LC/MS/MSAthyrotic: <0.4 ng/mL
307422Calcitonin82308CalcitoninGoal is none; monitor
for doubling time

978CEA
82378
Carcinoembrionic AntigenGoal is none

CEA and Calcitonin are only for medullary thyroid cancer monitoring.  CEA alone is not diagnostic. 

Tests which are not helpfuL

TPO – thyroid peroxidase antibodies (used to diagnose Hashimoto’s)
Thyroid Panel or Profile – often includes T3 uptake, total T4 or T3,  or free T4 index, none of which are helpful for thyroid cancer patients.
TSH with reflex – if TSH is within the lab reference range, free T4 will not be run. 

Always get a copy and check your lab order for the correct tests and diagnostic codes.  

ICD-10 CODES FOR THYROID CANCER MONITORING TESTS

ICD-10 Code: C73 (C73) 
Code Type: Diagnosis 
Description: Malignant neoplasm of thyroid gland

ICD-10 Code: E890 (E89.0) 
Code Type: Diagnosis 
Description: Postprocedural hypothyroidism

There are no specific ICD-10 codes for Medullary ThyCa (CEA and Calcitonin tests)
http://www.hipaaspace.com/Medical_Billing/Coding/International_Classification_Of_Diseases/ICD10_Codes_Lookup.aspx