A2P 10DLC for Medical Practices: What Registering to Text Patients Actually Involves

What A2P 10DLC is

A2P means application-to-person: messages sent by software rather than typed by a human on a handset. 10DLC means a 10-digit long code — an ordinary local number, as opposed to a short code or a toll-free number.

Put together, A2P 10DLC is the U.S. mobile carriers' registration scheme for businesses that send automated texts from ordinary local numbers. Before your practice can text an appointment reminder from its own area code, the business behind that number has to be registered and the campaign it's sending has to be approved.

It applies to every provider, not to any one vendor. If a competing service tells you texting works on day one with no registration, what they're describing is either an unregistered route the carriers will eventually filter, or a toll-free number, which has its own verification process.

What the carriers are actually checking

Registration has two layers, and they ask different questions.

• The brand — who the business is. Legal name, address, and the EIN, checked against IRS records. This is why the EIN is the piece that gates everything: nothing can be filed until the business has been identified.
• The campaign — what you intend to send. The message types, sample messages, and, most closely examined, how you collect consent.

The brand check is largely mechanical: the details either match the IRS record or they don't. The campaign check is a human reading your opt-in flow, and it is where filings actually fail.

The four disclosures your opt-in has to carry

Carriers expect the agreement itself and four specific disclosures alongside it. Every one of them, on the form, next to the box:

• What kind of messages the person will get.
• That message frequency varies.
• That message and data rates may apply.
• How to stop — the words STOP and HELP, spelled out.

Three more rules that fail filings more often than the wording does. The consent box must be unchecked by default: a pre-ticked box is not consent. It must not be bundled — agreeing to texts cannot be the same action as agreeing to terms of service. And on a form where a phone number is optional, consent must be optional too, or you are conditioning contact on agreeing to marketing.

Keep a record of the exact wording each person agreed to and when. Not a paraphrase, and not a flag saying they consented — the sentence itself, stored with a timestamp. In a dispute or an audit, the record is the wording.

What your privacy policy has to say

A reviewer opens the privacy policy your form links to and looks for one thing: whether mobile opt-in consent and phone numbers can be passed on. If the policy leaves that open, the campaign is rejected.

The carve-out has to be explicit — that opt-in consent and the numbers collected for messaging are never sold, rented, or shared with third parties or affiliates for their own marketing, and that numbers go only to the providers who deliver the messages, only in order to deliver them. It belongs in the sharing section, because that is the section that gets read.

How long it takes, and what actually delays it

Registration typically clears in about 10 to 14 business days from the point the filing is submitted — and it cannot be submitted before the business provides its EIN. That is the whole critical path: the clock starts at the EIN, not at signature.

Which means the delay worth planning around is an internal one. Practices that have their EIN to hand start immediately; practices that have to find it lose a week before the process begins.

Phone answering has no such dependency. At LunaFront the AI front desk is live and answering calls within 5 business days of a signed agreement, and registration runs in the background — so the phones are working while texting is still clearing. Any provider can sequence it this way; ask yours whether they do, because the alternative is waiting on both at once.

Questions worth asking your provider

• Who files the registration — you, or them?
• Whose brand is registered: yours, or theirs as an aggregate? This determines who owns the number if you leave.
• What happens to call answering while texting is pending?
• If the campaign is rejected, who fixes the opt-in flow and refiles?
• Will they show you the exact consent wording that gets filed?

This is a practical summary of a process we go through with every client, not legal advice. Carrier requirements change, and how they apply to your practice depends on facts we can't see from here — check anything consequential with your own counsel.

We file it, and the phones don't wait

LunaFront handles carrier registration as part of onboarding, and your AI front desk answers calls from day five regardless of where texting has got to.

Keep reading