Place of service missing or invalid
The place of service code is missing, not valid, or does not fit the service billed.
Usual causes
- Telehealth billed with the wrong place of service for the payer.
- Facility service billed with office place of service, or the reverse.
- Service facility address missing for a non-office setting.
The fix
Confirm where the service happened and the payer's rules, correct the place of service (and the facility address if needed) and resubmit.
Appeal or corrected claim?
Corrected claim.
Deadline to watch
Timely filing limit.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
M77 in short
What does M77 mean?
The place of service code is missing, not valid, or does not fit the service billed. The official X12 text reads: "Missing/incomplete/invalid/inappropriate place of service."
What usually causes a M77 denial?
Telehealth billed with the wrong place of service for the payer. Facility service billed with office place of service, or the reverse. Service facility address missing for a non-office setting.
How do I fix M77?
Confirm where the service happened and the payer's rules, correct the place of service (and the facility address if needed) and resubmit.
Should I appeal M77 or send a corrected claim?
Corrected claim. Corrected claim.
What deadline applies to M77?
Timely filing limit.