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diff --git a/src/mongo/db/s/shardsvr_collmod_command.cpp b/src/mongo/db/s/shardsvr_collmod_command.cpp
new file mode 100644
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+++ b/src/mongo/db/s/shardsvr_collmod_command.cpp
@@ -0,0 +1,125 @@
+/**
+ *    Copyright (C) 2018-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
+
+#include "mongo/db/auth/authorization_checks.h"
+#include "mongo/db/auth/authorization_session.h"
+#include "mongo/db/coll_mod_gen.h"
+#include "mongo/db/coll_mod_reply_validation.h"
+#include "mongo/db/commands.h"
+#include "mongo/db/curop.h"
+#include "mongo/db/s/collmod_coordinator.h"
+#include "mongo/db/s/sharding_state.h"
+#include "mongo/logv2/log.h"
+#include "mongo/s/chunk_manager_targeter.h"
+#include "mongo/s/grid.h"
+
+namespace mongo {
+namespace {
+
+class ShardsvrCollModCommand final : public BasicCommandWithRequestParser<ShardsvrCollModCommand> {
+public:
+    using Request = ShardsvrCollMod;
+    using Response = CollModReply;
+
+    ShardsvrCollModCommand() : BasicCommandWithRequestParser() {}
+
+    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
+        return Command::AllowedOnSecondary::kNever;
+    }
+
+    bool supportsWriteConcern(const BSONObj& cmd) const override {
+        return true;
+    }
+
+    bool collectsResourceConsumptionMetrics() const override {
+        return true;
+    }
+
+    std::string help() const override {
+        return "Internal command, which is exported by the primary sharding server. Do not call "
+               "directly. Modifies collection.";
+    }
+
+    Status checkAuthForCommand(Client* client,
+                               const std::string& dbname,
+                               const BSONObj& cmdObj) const override {
+        const NamespaceString nss(parseNs(dbname, cmdObj));
+        return auth::checkAuthForCollMod(AuthorizationSession::get(client), nss, cmdObj, false);
+    }
+
+    bool skipApiVersionCheck() const override {
+        // Internal command (server to server).
+        return true;
+    }
+
+    bool runWithRequestParser(OperationContext* opCtx,
+                              const std::string& db,
+                              const BSONObj& cmdObj,
+                              const RequestParser& requestParser,
+                              BSONObjBuilder& result) override {
+        auto const shardingState = ShardingState::get(opCtx);
+        uassertStatusOK(shardingState->canAcceptShardedCommands());
+
+        uassert(ErrorCodes::InvalidOptions,
+                str::stream() << Request::kCommandName
+                              << " must be called with majority writeConcern, got "
+                              << opCtx->getWriteConcern().wMode,
+                opCtx->getWriteConcern().wMode == WriteConcernOptions::kMajority);
+
+        opCtx->setAlwaysInterruptAtStepDownOrUp();
+
+        // Since this operation is not directly writing locally we need to force its db
+        // profile level increase in order to be logged in "<db>.system.profile"
+        const auto& cmd = requestParser.request();
+        CurOp::get(opCtx)->raiseDbProfileLevel(
+            CollectionCatalog::get(opCtx)->getDatabaseProfileLevel(cmd.getDbName()));
+
+        auto coordinatorDoc = CollModCoordinatorDocument();
+        coordinatorDoc.setCollModRequest(cmd.getCollModRequest());
+        coordinatorDoc.setShardingDDLCoordinatorMetadata(
+            {{cmd.getNamespace(), DDLCoordinatorTypeEnum::kCollMod}});
+        auto service = ShardingDDLCoordinatorService::getService(opCtx);
+        auto collModCoordinator = checked_pointer_cast<CollModCoordinator>(
+            service->getOrCreateInstance(opCtx, coordinatorDoc.toBSON()));
+        result.appendElements(collModCoordinator->getResult(opCtx));
+        return true;
+    }
+
+    void validateResult(const BSONObj& resultObj) final {
+        StringDataSet ignorableFields({"raw", "ok", "errmsg"});
+        auto reply = Response::parse(IDLParserErrorContext("CollModReply"),
+                                     resultObj.removeFields(ignorableFields));
+        coll_mod_reply_validation::validateReply(reply);
+    }
+} shardsvrCollModCommand;
+
+}  // namespace
+}  // namespace mongo