Hospitals and clinics that grow on Odoo hit the same wall: patient records, departments, wards, medical staff, and clinical reference data end up scattered across res.partner, a few custom fields, and disconnected spreadsheets. Odoo core has no concept of a patient distinct from a generic contact, no unified clinical taxonomy, and no shared security layer for protected health data. Every team that tries to bolt on appointments, pharmacy, laboratory, or billing modules ends up re-inventing the same base objects slightly differently, so the modules never link cleanly and reporting fractures. This foundation module fixes that at the root: it establishes the canonical, shared models and base logic that every downstream HMS module reads from, so the whole clinical suite speaks one data language.

We build a dedicated base module whose __manifest__.py declares the low-level dependency the rest of your HMS stack sits on. At its core are new models.Model definitions — a patient entity extending or delegating to res.partner, plus departments, wards/rooms, medical staff roles, and shared reference sets (blood groups, medical specialities, appointment/case states) — each with typed fields, @api.depends computed values (age from date of birth, occupancy counts, active-case rollups), and @api.constrains validation so bad clinical data is rejected at the ORM layer, not discovered later in a report. Sequences (ir.sequence) generate human-readable patient and case identifiers; selection and Many2one relations give every future module clean foreign keys instead of free-text. Because this is the shared layer, we design the schema for extension — mixins and abstract models other modules inherit — so appointments, pharmacy, and lab modules add behavior without forking the base.

Security is treated as a first-class deliverable, not an afterthought. We ship ir.model.access.csv access rules mapped to purpose-built groups (receptionist, nurse, physician, records officer, administrator) and ir.rule record rules that enforce record-level visibility — for example, scoping records by department or company for multi-branch groups. Views are delivered as clean XML (list, form, kanban, search) with an OWL-friendly structure, menus and actions wired under a dedicated Hospital root menu, and QWeb report templates for the base identity and summary documents. Where day-two automation helps, we add server actions and automated actions (base.automation) — for instance, stamping audit fields or firing follow-up activities on state changes. The models are exposed cleanly over Odoo's XML-RPC / JSON-RPC API so external systems (kiosks, patient portals, insurance connectors) can integrate against a stable contract.

This is build-to-order, so nothing is downloaded off a shelf. After a short scoping call we confirm the exact model set, security matrix, and Odoo edition (Community vs Enterprise changes what we can lean on natively), then build against your target version — Odoo 17.0, 18.0, or 19.0 — and validate on a staging copy of your database before anything touches production. Typical delivery is 2 to 4 weeks from confirmed scope. You receive installable source, documentation, UAT sign-off, and a post-go-live support window. Pricing starts from $249 (indicative, single-company base scope); multi-company/multi-branch record rules, deeper localization of clinical reference data, and the volume of legacy patient data to migrate increase the quoted scope.