Methylmalonic Acid (MMA), Serum

CPT: 83921
Vitamins

What This Test Measures

Metabolite elevated in functional B12 deficiency even before serum B12 drops; more sensitive than B12 level.

Preparation

No fasting required
No special prep. More sensitive than B12 alone for detecting functional deficiency.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

Functional B12 status test; elevated when B12 inadequate at tissue level

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

D51.9Vitamin B12 deficiency anemia, unspecified
G62.0Drug-induced polyneuropathy

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Lab Codes

Proprietary codes used by each lab for this test.

ARUP Laboratories
0099431(order_code)
LabCorp
706937(order_code)
Mayo Clinic Labs
MMA(order_code)
Quest Diagnostics
36754(order_code)

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Related Tests

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CPT: 82607

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CPT: 82746

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CPT: 82747

Methylmalonic Acid (MMA), Urine

CPT: 83921

Vitamin B1 (Thiamine)

CPT: 84425

Vitamin A (Retinol)

CPT: 82380

For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.