Metro 2 Creditor Classification Codes (Field K1-4)

The K1 segment exists for one reason: the company furnishing the tradeline is not the company the consumer originally borrowed from. Collection agencies, debt buyers, collection attorneys, and servicers append a K1 to carry the ORIGINAL creditor's name so the consumer can recognise the debt on their report. Creditor Classification is the companion field on that segment. It is a two-digit code saying what industry the original creditor was in: retail, medical, banking, utilities, and so on. The name says who; the classification says what kind.

That makes this a small field with outsized consequences. A consumer looking at a collection tradeline from an agency they have never heard of has two clues about where the debt came from, and this code is one of them. Get it wrong and you have furnished a plausible-looking but inaccurate tradeline, which is exactly the kind of item that generates a direct dispute. Get it right and the tradeline explains itself. The rule of thumb that resolves most classification questions is that this field describes the ORIGINAL creditor's line of business, never the furnisher's own. A debt buyer purchasing a portfolio of hospital receivables classifies those accounts 02 (Medical/health care), not by anything about the buying entity.

Set-wide cross-field rules follow from that. A K1 segment only belongs on a record where the reporting entity is not the original creditor, which in practice means the Base Segment usually carries a collections-shaped Account Type such as 48 (Collection Agency/Attorney Account) or 0C (Debt Buyer Account), or an industry Account Type such as 90 (Medical Debt), 92 (Utility Open Account), or 93 (Child Support). The classification code must be consistent with that Account Type: a tradeline reporting Account Type 90 with a classification of 10 (Utilities) is internally contradictory and will read as a data-quality defect. Where an account changed hands, the K2 (Purchased From / Sold To) segment records the transfer counterparty. K1 and K2 answer different questions and are not interchangeable: K1 names the creditor at origination, K2 names the party you bought the paper from or sold it to. A purchased account frequently needs both.

Two further set-wide points. First, classification is descriptive, not a status: it never changes because the account went delinquent, was charged off, or was settled, and it does not move when the debt is resold. The classification is fixed by the original creditor's industry at origination and stays fixed for the life of the tradeline. Second, medical debt is the case where this field does real regulatory work. Code 02 exists so a medical account can be classified as medical WITHOUT the tradeline disclosing the provider's identity or the nature of the services, which is what the reporting rules for medical information require. That is covered in detail on the 02 page.