These are for E/M services only and are limited to the below circumstances (per CMS):
New Patient - 99201, 99202, and 99203
Established Patient - 99211, 99212, and 99213
Effective January 1, 2005, the following code is included under the primary care exception: G0344 - Initial preventive physical examination; face-to-face visit services limited to new beneficiary during the first 12 months of Medicare enrollment.
Effective January 1, 2011, the following codes are included under the primary care exception: HCPCS codes G0438 (Annual wellness visit, including personal preventive plan service, first visit) and G0439 (Annual wellness visit, including personal preventive plan service, subsequent visit).
If codes other than the ones listed above are billed with the GE modifier, the services will be returned as Unprocessable.