Mercury is great. We mean it. The dashboard hums, the API plays nice, and account opening takes about as long as a coffee break. If you run a SaaS company, Mercury is probably the best choice on the market.

But you don't run a SaaS company. You run a medical practice. That's a different sport.

Your revenue does not look like stable, recurring revenue from contracts. It looks like ERA 835 files landing at uneven intervals from BCBS, Aetna, Cigna, Medicare, Medicaid, and a long tail of regional plans. Your deposits do not match billing one-to-one. They split across patients, with denial codes, contractual write-offs, and patient-responsibility lines that someone has to reconcile by hand. Your cash isn't burn. It's float across legal entities.

So when you compare Mercury and Lemma, you're not comparing two banks. You're asking which one was built for the way medical practices actually get paid.

When Mercury Wins

Single legal entity. Mostly cash-pay or card-pay revenue. Under $1M annual. You like a clean dashboard and a yield product on idle cash. Mercury is good here. Free ACH, no monthly fees, treasury yield north of 4%, virtual cards for vendors. If your practice is a concierge clinic, a direct primary care setup, or any cash-pay specialty without insurance billing weight, Mercury covers it.

Most healthcare practices are not this practice.

When Lemma Wins

Three things medical practices need from a bank that generalist banks can't deliver. Lemma handles all three natively.

ERA 835 files. Lemma speaks healthcare. When BCBS sends a payment with 50 patient-level adjustments, Lemma parses the 835 and matches it to your deposit automatically. What costs a billing team 30 hours a month and $12,600 a year to reconcile on a generalist bank happens in the background here.

Paper checks and EOBs. They still arrive, especially in dental, behavioral health, and PT. Lemma's Medical Lockbox is $2.50 per check with OCR and ERA matching included—no scanning operation to staff, no vendor charging $0.50 to $2.00 per check plus minimums, no waiting on the mailroom.

Multi-entity. If you operate an MSO supporting multiple PCs (the standard structure in most CPOM states), Lemma gives you separate FDIC coverage per entity, separate audit trails, and a consolidated dashboard that respects the legal structure. You don't have to choose between FDIC protection per PC and a unified view of the business.

What Healthcare-Native Actually Means

ERA 835 files come in and post automatically. Paper checks land in the lockbox and digitize the same day. Multi-entity onboarding takes 5 to 10 days, not the 60 to 90 of a traditional bank, and every entity gets its own FDIC coverage. The IntraFi sweep network covers up to $10M per entity. ACH is free. Wires are flat $15. Operating cash earns 1.75% APY across the structure. One dashboard. Every entity. Every payer. Every account.

It also means denial codes don't get lost. Adjustments don't get manually keyed. The audit trail isn't a billing team's spreadsheet. It's the system of record.

The Math

Behavioral health group, three locations, $3M reimbursements, $400K operating cash.

On Mercury: ~$12,600 a year in manual ERA reconciliation, $4,800 in lockbox vendor fees, and a treasury yield on $400K at 4% looks decent at $16,000, but only on the swept portion. The operating account itself sits at 0%.

On Lemma: ERA matching is automated. Lockbox is included. The full $400K earns 1.75% APY (about $7,000), and you get back $12,600 of billing-team hours and $4,800 of avoided vendor fees. Net swing is roughly $24,400 a year. Plus a faster monthly close. Plus a cleaner audit trail.

Your numbers will be different. The pattern won't.

How to Choose a Banking Provider

Pick Mercury if your practice is single-entity, mostly cash-pay or card-pay, and under $1M in revenue.

Pick Lemma if you handle ERA 835 files, get any paper checks, run an MSO-PC structure, operate multiple locations, or want healthcare reconciliation built in instead of bolted on.