CurrentBlue Cross Blue Shield - OklahomaPolicy CPCPLAB010

Vitamin B12 and Methylmalonic Acid Testing

Defines Blue Cross Blue Shield - Oklahoma's reimbursement criteria for serum vitamin B12 and methylmalonic acid testing across plan products and outlines non-reimbursable tests; applies to providers submitting claims for members covered by BCBSOK plans.

Policy Summary

PayerBlue Cross Blue Shield - Oklahoma

PolicyVitamin B12 and Methylmalonic Acid Testing

Policy CodePolicy CPCPLAB010

Change TypeMaterial updates to frequency and non-reimbursable tests

Effective DateApr 15, 2025

Next Review DateN/A

Key ActionSubmit claims reflecting the reimbursable frequency (once every three months) and provide documentation upon request.

SourceLink

POLICY UPDATE CHANGES

A three-month testing frequency for all vitamin B testing/screening was added: Total vitamin B12 (serum cobalamin) testing may be reimbursable once every three months for specified situations.

A new non-reimbursable statement was added: For all other situations not described above, total vitamin B12 (serum cobalamin) testing is not reimbursable.

Holotranscobalamin testing was explicitly stated as not reimbursable for screening, testing, or confirmation of vitamin B12 deficiency (added previously and noted in update history).

1 per 3momax frequency

7 rulesreimbursement rules

holotranscobalaminexcluded test

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Reimbursement Criteria

Reimbursement criteria

Covered when ALL of the following are met:

Frequency limit applies: Total vitamin B12 (serum cobalamin) testing reimbursable once every three months

AND at least ONE of the following clinical situations is present

ALL of the following
- Cutaneous signs: hyperpigmentation, jaundice, vitiligo
- Gastrointestinal signs: glossitis
- Hematologic signs: anemia (macrocytic, megaloblastic), leukopenia, pancytopenia, thrombocytopenia, thrombocytosis
- Neuropsychiatric signs: areflexia, cognitive impairment (including dementia-like symptoms and acute psychosis), gait abnormalities, irritability, loss of proprioception and vibratory sense, olfactory impairment, peripheral neuropathy
Individuals undergoing treatment for vitamin B12 deficiency
ALL of the following
- Decreased ileal absorption (Crohn’s disease, ileal resection, tapeworm infection, prior or scheduled bariatric procedures such as Roux-en-Y gastric bypass, sleeve gastrectomy, biliopancreatic diversion/duodenal switch)
- Decreased intrinsic factor (atrophic gastritis, pernicious anemia, postgastrectomy syndrome)
- Transcobalamin II deficiency
- Inadequate B12 intake (due to alcohol abuse; age >75 years or elderly individuals being evaluated for dementia; vegans or strict vegetarians including exclusively breastfed infants of vegetarian/vegan mothers; due to an eating disorder)
- Prolonged medication use (histamine H2 blocker >12 months; proton pump inhibitor >12 months; metformin >4 months)
Asymptomatic high-risk individuals with low-normal B12 or suspected deficiency despite normal/low-normal serum B12: methylmalonic acid testing may be reimbursable
Methylmalonic acid testing for evaluation of inborn errors of metabolism may be reimbursable

Exclusions (NOT reimbursable)

Screening in healthy, asymptomatic individuals
Homocysteine testing for confirmation of vitamin B12 deficiency
Holotranscobalamin testing for screening, testing, or confirmation of vitamin B12 deficiency
All other situations not described above for total vitamin B12 testing
Non-reimbursable

Procedure Codes and Frequency

Procedure codes guidancemixed

Procedure codes not exhaustively listed; inclusion does not guarantee coverage

Testing frequency threshold

Maximum reimbursable frequencyTotal vitamin B12 (serum cobalamin) testing may be reimbursable once every three months

Applies toAll reimbursable situations listed under Reimbursement Information (signs/symptoms, treatment, risk factors)

Related billing guidanceClaims should reflect the reimbursable frequency; tests outside the frequency may be denied

Documentation & Billing

Documentation Required

Documentation & Claim Submission

Providers are responsible for submission of accurate documentation of services performed. Providers are expected to submit claims using valid code combinations from HIPAA-approved code sets and to code claims appropriately per industry-standard coding guidelines (e.g., Uniform Billing, AMA CPT, HCPCS, ICD-10-CM/PCS, NDCs, DRG, CMS NCCI). Claims are subject to code edit protocols and review against benefit coverage, provider contract terms, medical and clinical payment and coding policies, and coding software logic. Upon request, providers must submit additional documentation to support medical necessity and reimbursement.

Billing Rule

Billing rule / Denial Risk

Claims for total vitamin B12 (serum cobalamin) testing are reimbursable at a frequency of once every three months only when medical necessity is met. To avoid denial, ensure claims meet the clinical indications and frequency limits listed in the policy and are supported by documentation. Examples of covered indications include: signs or symptoms of B12 deficiency (cutaneous, gastrointestinal, hematologic, neuropsychiatric), current treatment for B12 deficiency, or presence of risk factors (e.g., decreased ileal absorption such as Crohn's disease or prior ileal resection, decreased intrinsic factor such as pernicious anemia, transcobalamin II deficiency, inadequate intake including alcohol abuse or advanced age).

Plan Documents and Clinical Definitions

Plan documents governing member benefits when conflicts exist

Governing documentsCertificates of Health Care Benefits, benefit booklets, Summary Plan Descriptions, and other coverage documents

Conflict resolution — plan vs policyIf a conflict arises between a Clinical Payment and Coding Policy and any plan document, the plan document will govern

Conflict resolution — provider contractIf a conflict arises between a Clinical Payment and Coding Policy and any provider contract, the provider contract will govern

Clinical indications and frequency limits for serum B12 testing

Covered clinical indicationsIndividuals with signs/symptoms (cutaneous, gastrointestinal, hematologic, neuropsychiatric), individuals undergoing treatment, and individuals with specified risk factors

Risk factors (selected)