You are correct. A modular meter center with a main circuit breaker counts as one service disconnect.Here's why: The "6 Disconnect Rule"

NEC 230.71(A) limits the number of service disconnects at a building or structure to a maximum of six.

Main Breaker as the Disconnect

The main circuit breaker in the modular meter center is the single device that disconnects all power to the downstream load center(s) or distribution panels.

Modular does not equal individual service disconnects: The fact that a modular meter center might have 12 tenant meters and individual breakers does not matter. All of them can be disconnected at once by the one main breaker.

Important Considerations



Rating of the Main

The combined rating of the service disconnects cannot exceed the ampacity of the service conductors.

Grouping

NEC 230.72(A) requires service disconnects to be grouped and readily accessible. They're grouped in the meter center, so that's satisfied.

Labeling

Clear labeling of each disconnect is required, indicating what it controls.

In summary, if you have a modular meter center with a single main breaker that can disconnect the entire service, it counts as ONE of your allowed service disconnects, regardless of the number of meters it serves. Flag for review