| Department | Email Address | Phone Number | Fax Number |
| Referral Services | hdmgrefmgmt@hdmg.net | 661-951-3000 | 661-951-3059 |
| Claims | hdmgclaims@hdmg.net | 661-726-3800 | 661-726-3867 |
| Billing | hdmgffs@hdmg.net | 661-945-5984 | |
| Marketing | hdmgmktg@hdmg.net | 661-951-3040 | 661-951-3045 |
| IPA | hdmgipa@hdmg.net | 661-726-3866 | 661-726-3888 |
| Member Services | hdmgmemsvcs@hdmg.net | 800-266-4364 | 661-951-3261 |
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